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        IN THE UNITED STATES COURT OF APPEALS
                 FOR THE FIFTH CIRCUIT      United States Court of Appeals
                                                                            Fifth Circuit

                                                                           FILED
                                                                       August 18, 2017
                                 No. 16-20505
                                                                        Lyle W. Cayce
                                                                             Clerk
MARVIN RAY YATES; KEITH COLE; JACKIE BRANNUM; RICHARD
ELVIN KING; FRED WALLACE; LAVAR JOHN SANTEE,

             Plaintiffs – Appellees,

v.

BRYAN COLLIER; ROBERTO M. HERRERA; TEXAS DEPARTMENT OF
CRIMINAL JUSTICE,

             Defendants – Appellants.




                Appeal from the United States District Court
                     for the Southern District of Texas


Before REAVLEY, ELROD, and GRAVES, Circuit Judges.
JENNIFER WALKER ELROD, Circuit Judge:
      This appeal presents yet another chapter in a long saga of challenges to
conditions of confinement in prisons throughout this circuit. The plaintiffs are
inmates in the Wallace Pack Unit, a prison operated by the Texas Department
of Criminal Justice. They allege violations of the Eighth Amendment, the
Americans with Disabilities Act, and the Rehabilitation Act due to the high
temperatures in the prison housing areas. Plaintiffs sought, and the district
court granted, certification of a general class and two subclasses, and the
defendants now appeal. Because we conclude that the district court did not
abuse its discretion, we AFFIRM.
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                                   No. 16-20505
                                          I.
      The six named Plaintiffs are inmates in the Wallace Pack Unit, a prison
operated by the Texas Department of Criminal Justice (TDCJ). Plaintiffs
brought this lawsuit in 2014 against TDCJ, Bryan Collier (TDCJ’s executive
director), and Roberto Herrera (the Pack Unit’s warden) (collectively, the
Defendants). The Pack Unit houses approximately 1,400 inmates. Though
portions of the Pack Unit are air-conditioned, it is undisputed that the inmate
housing areas are not. During the summer months, indoor temperatures
within the Pack Unit housing area can reach 100 degrees and consistently
exceed 90 degrees. TDCJ is aware of these high temperatures as it routinely
monitors the outdoor apparent temperatures at the Pack Unit during the
summer months. Acknowledging that these high temperatures are a potential
risk to the health and safety of the inmates in the Pack Unit and in an effort
to reduce the risk from these high temperatures, Defendants claim that they
provide     certain   “heat-mitigation”   measures—including     more    frequent
showers, cold drinking water, fans, and temporary access to air-conditioned
“respite areas” outside the housing area.
      Up until this lawsuit was filed, TDCJ’s policy regarding mitigation
measures remained largely unchanged, despite the heat-related injuries
occurring within the Pack Unit and in various other Texas prisons. Indeed,
since 1998, twenty or more inmates have died as a result of excessive heat.
This history led the district court to conclude that, “as a factual matter,” there
was a “significant history of serious heat related illnesses” within the Pack
Unit. Only in 2015, after this lawsuit was filed, did TDCJ begin its respite-area
practice.
      Of the six named Plaintiffs, only one is younger than 60 years old and
has no medical conditions that would affect his sensitivity to heat. The
remaining five named Plaintiffs range in age from 60 to 72 years and all have
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                                        No. 16-20505
one or more conditions that render them particularly sensitive to heat,
including Type II diabetes, coronary arterial disease, high blood pressure, high
cholesterol, hypertension, schizoaffective disorder, and obesity.
      Plaintiffs assert two causes of action. First, they assert an Eighth
Amendment claim against Collier and Herrera. Second, they claim that TDCJ
has failed to provide reasonable accommodations for inmates with heat-
sensitive disabilities in violation of the Americans with Disabilities Act and
the Rehabilitation Act. Plaintiffs seek a declaratory judgment and a
permanent injunction requiring defendants to “maintain a safe indoor
apparent temperature (e.g., maintaining a heat index of 88 degrees or lower)
inside each of the Pack Unit’s housing areas . . . or enter other injunctive relief
sufficient to protect the health and safety of the prisoners at the Pack Unit.” 1
      Plaintiffs moved to certify three classes, one general class and two
subclasses:
      General Class: All inmates who currently are, or in the future
      will be, incarcerated at the Pack Unit, and who are subjected to
      TDCJ’s policy and practice of failing to regulate high indoor heat
      index temperatures in the housing areas.
      Heat-Sensitive Subclass: All people who are incarcerated at the
      Pack Unit, or in the future will be, that are subjected to TDCJ’s
      policy and practice of failing to regulate high indoor heat index
      temperatures in the housing areas, and either: (1) have a
      physiological condition that places them at increased risk of heat-
      related illness, injury, or death (including, but not limited to,
      suffering from obesity, diabetes, hypertension, cardiovascular
      disease, psychiatric conditions, cirrhosis of the liver, chronic
      obstructive pulmonary disease, cystic fibrosis, asthma, sweat
      gland dysfunction, and thyroid dysfunction); or, (2) are prescribed
      an anticonvulsant, anticholinergic, antipsychotic, antihistamine,
      antidepressant, beta blocker, or diuretic; or (3) are over age 65.



      1   Plaintiffs also seek attorneys’ fees, but they do not seek damages.
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                                            No. 16-20505
      Disability SubClass: All people incarcerated at the Pack Unit, or
      who will be in the future, that are subjected to TDCJ’s policy and
      practice of failing to regulate high indoor heat index temperatures
      in the housing areas and suffer from a disability that substantially
      limits one or more of their major life activities and who are at
      increased risk of heat-related illness, injury, or death due to their
      disability or any medical treatment necessary to treat their
      disability.
      The district court certified all three classes. It concluded that Plaintiffs
sufficiently demonstrated that they met all requirements of Federal Rule of
Civil Procedure 23(a). It then determined that certification was authorized
under Rule 23(b)(2). Last, the district court rejected Defendants’ argument
that the Prison Litigation Reform Act—which directs that prospective relief in
the prison context “shall extend no further than necessary to correct the
violation,” 18 U.S.C. § 3626(a)(1)(A)—must be applied as part of the Rule
23(b)(2) analysis.
      Defendants moved under Rule 23(f) 2 for authorization to appeal the
district court’s certification order, and this court granted the motion.
                                                II.
      “We review the district court’s decision to certify a class for an abuse of
discretion.” M.D. ex rel. Stukenberg v. Perry, 675 F.3d 832, 836 (5th Cir. 2012)
(quoting Bell Atl. Corp. v. AT&T Corp., 339 F.3d 294, 301 (5th Cir. 2003)). “A
trial court abuses its discretion when its ruling is based on an erroneous view
of the law or a clearly erroneous assessment of the evidence.” Bocanegra v.
Vicmar Servs., Inc., 320 F.3d 581, 584 (5th Cir. 2003). This deference stems



      2   Fed. R. Civ. P. 23(f) provides:
      A court of appeals may permit an appeal from an order granting or denying
      class-action certification under this rule if a petition for permission to appeal
      is filed with the circuit clerk within 14 days after the order is entered. An
      appeal does not stay proceedings in the district court unless the district judge
      or the court of appeals so orders.
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                                  No. 16-20505
from “a recognition of the essentially factual basis of the certification inquiry
and of the district court’s inherent power to manage and control pending
litigation.” Perry, 675 F.3d at 836. Nonetheless, this broad discretion must
operate “within the framework of Rule 23,” and we “review de novo whether
the district court applied the correct legal standards.” Id. (citations omitted).
                                       III.
      It is well-established in our circuit “that the Eighth Amendment
guarantees inmates a right to be free from exposure to extremely dangerous
temperatures without adequate remedial measures.” Hinojosa v. Livingston,
807 F.3d 657, 669 (5th Cir. 2015). Over the past several years, we have decided
numerous appeals arising from cases in which inmates have challenged the
heat levels within prisons located throughout this circuit. We have repeatedly
upheld district court findings that the heat levels within these prisons violate
the Eighth Amendment, and we have done so in the context of a class action in
at least one case.
      In Gates v. Cook, 376 F.3d 323 (5th Cir. 2004), we upheld a permanent
class-wide injunction based on the Eighth Amendment, which required the
Mississippi Department of Corrections to “provide fans, ice water, and daily
showers when the heat index is 90 degrees or above,” id. at 339–40, even
though most of the inmates had the benefit of industrial sized fans as well as
smaller personal fans. Id. at 334. Summer temperatures in the area averaged
above 90° Fahrenheit, and the ventilation within the facility was “inadequate
to afford prisoners a minimal level of comfort during the summer months,” and
the inmates were “not afforded extra showers, ice water, or fans . . . when the
heat index [was 90° Fahrenheit] or above.” Id. Similarly, in Ball v. LeBlanc,
792 F.3d 584 (5th Cir. 2015), we affirmed the district court’s finding that the
heat within a prison housing area posed a substantial risk of serious harm to
inmates, where the heat index ranged from 81.5° Fahrenheit to 107.79°
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                                 No. 16-20505
Fahrenheit and surpassed 100° Fahrenheit on five or more days during a
roughly two week period. Id. at 590–91, 592–94. We did so even though the
inmates had continued access to potable water and ice, and despite the
defendant’s argument that “because it provide[d] the remedies [upheld in
Gates], there can be no Eighth Amendment violation as a matter of law.” Id. at
590, 592. And in Blackmon v. Garza, 484 F. App’x 866 (5th Cir. 2012), we
reversed the grant of judgment as a matter of law in favor of TDCJ officials.
Id. at 874. Though recognizing that TDCJ had taken some remedial steps, such
as providing cool ice water three times a day and allowing extra showers, we
concluded this was insufficient to justify judgment in TDCJ’s favor. We relied
in part on the fact that “[t]here was no air-conditioning,” “the windows were
sealed,” the unit “did not have a water fountain,” and “the inmates were not
able to use personal fans,” though there was a large industrial fan available.
Id. at 871–72.
      Indeed, TDCJ officials are, or have been, defendants in numerous other
cases alleging Eighth Amendment violations based on excessive heat in prison.
See, e.g., Hinojosa, 807 F.3d at 661 (deciding appeal involving TDCJ prisoner
who suffered a seizure at night due to high indoor temperatures, “[fell] out of
his bed and was convulsing,” and died twenty minutes later); Webb v.
Livingston, 618 F. App’x 201, 204 (5th Cir. 2015) (deciding appeal involving the
“heat-related deaths of five prisoners who died while housed in facilities
operated by [TDCJ]”); Valigura v. Mendoza, 265 F. App’x 232, 233–34 (5th Cir.
2008) (deciding appeal involving prisoner who alleged that “temperatures in
the bunk area reached into the nineties and hundreds due to poor ventilation”
and that “he was not able to use the restroom or showers without lengthy waits,
which caused him severe discomfort”).
      In short, we have repeatedly recognized the serious risk of harm that
excessive heat can pose in the prison context absent adequate mitigating
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                                  No. 16-20505
measures, and we have consistently found evidence sufficient in these cases to
support an Eighth Amendment violation, even when certain mitigating
measures were available. It is against this backdrop that we now address the
discrete issue presented in this appeal: whether the district court erred in
certifying the General Class and the two subclasses.
      Defendants challenge only two of the class certification criteria. First,
they assert that the district court erred in concluding that Plaintiffs
demonstrated a common question of law or fact for each of the classes. 3 Second,
Defendants argue that the district court erred in concluding that the proposed
classes could be certified under Rule 23(b)(2). As part of this second argument,
Defendants reassert their contention that the Prison Litigation Reform Act
precludes certification in this case. We discuss each in turn.
                                        A.
                                        1.
      Rule 23(a) states that a class may be certified “only if . . . there are
questions of law or fact common to the class.” Fed. R. Civ. P. 23(a)(2). At first
blush, it might seem that Rule 23(a)(2)’s requirement can be easily satisfied.
After all, “any competently crafted class complaint literally raises common
questions.” Wal-Mart Stores, Inc. v. Dukes, 564 U.S. 338, 349 (2011) (alteration
omitted) (quotation marks omitted). As the Supreme Court has indicated,
however, Rule 23(a)(2) demands that the putative class members’ claims “must
depend upon a common contention” that “must be of such a nature that it is
capable of class-wide resolution—which means that determination of its truth
or falsity will resolve an issue that is central to the validity of each one of the




      3 Defendants do not make any argument regarding numerosity, typicality, or
adequacy. See Fed. R. Civ. P. 23(a).
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                                   No. 16-20505
claims in one stroke.” Wal-Mart, 564 U.S. at 350; see also Perry, 675 F.3d at
840.
        Thus, what matters for Rule 23(a) “‘is not the raising of common
questions—even in droves—but, rather the capacity of a class-wide proceeding
to generate common answers apt to drive the resolution of the litigation.’” Wal-
Mart, 564 U.S. at 350 (emphasis omitted) (quoting Nagareda, Class
Certification in the Age of Aggregate Proof, 84 N.Y.U. L. Rev. 97, 132 (2009)).
It is not enough, then, that plaintiffs “have all suffered a violation of the same
provision of law” because laws can be violated in different ways, and so
suffering a violation of the same provision of law “gives no cause to believe that
all [the plaintiffs’] claims can productively be litigated at once.” Wal-Mart, 564
U.S. at 350; Perry, 675 F.3d at 840 (“Further, the members of a proposed class
do not establish that their claims can productively be litigated at once, merely
by alleging a violation of the same legal provision by the same defendant.”
(quotation marks omitted)).
        “Rule 23 does not set forth a mere pleading standard.” Instead, a plaintiff
“must affirmatively demonstrate his compliance with the Rule—that is, he
must be prepared to prove that there are in fact . . . common questions of law
or fact[.]” Wal-Mart, 564 U.S. at 350. And the district “must conduct a rigorous
analysis of the Rule 23 prerequisites before certifying a class.” Perry, 675 F.3d
at 837 (alteration omitted) (quoting Castano v. Am. Tobacco Co., 84 F.3d 734,
740 (5th Cir. 1996)); Wal-Mart, 564 U.S. at 350–51 (same). Because “class
determination generally involves considerations that are enmeshed in the
factual and legal issues comprising the plaintiff’s cause of action,” Wal-Mart,
564 U.S. at 351, we have “traditionally construed [the] directive [to conduct a
rigorous analysis] to require district courts to, inter alia, ‘look beyond the
pleadings to understand the claims, defenses, relevant facts, and applicable
substantive law in order to make a meaningful determination of the
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                                  No. 16-20505
certification issues.’” Perry, 675 F.3d at 837 (quoting McManus v. Fleetwood
Enters., Inc., 320 F.3d 545, 548 (5th Cir. 2003)); see also Wal-Mart, 564 U.S. at
350–51 (same).
                                        2.
      The district court concluded that Plaintiffs had demonstrated the
existence of “questions of law or fact common” to the General Class and the
subclasses. See Fed. R. Civ. P. 23(a)(2). For the General Class, the district court
identified the following common questions: (1) “that excessive heat constitutes
a condition of confinement that poses a substantial risk of serious harm to the
health of all inmates”; and (2) “that TDCJ officials were deliberately indifferent
to the risk posed to the inmates.” Further, the district court concluded that the
“heat-sensitive subclass has the same common contentions as the General
Class, but the subclass must only prove a substantial risk of serious harm, and
deliberate indifference, to the inmates with heat sensitivity.” Finally, as to the
disability subclass, the district court stated that “[o]ne additional common
contention of the disability subclass is that TDCJ officials failed to provide
reasonable accommodations to inmates suffering from disabilities that may
impact (or that cause the inmates to take medication that may impact) their
ability to withstand extreme heat.”
                                 i. General Class
      Defendants’ overarching objection to the district court’s certification of
the General Class focuses on the first common contention—that “excessive
heat constitutes a condition of confinement that poses a substantial risk of
serious harm to the health of inmates.” Defendants do not contest that putative
class members are all exposed to essentially the same temperatures.
Defendants also do not contest that Pack Unit temperatures, particularly in
the summer months, are often extreme. Nor do they contest that, absent
mitigation measures, every inmate in the Pack Unit is at a substantial risk of
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                                  No. 16-20505
serious harm due to the heat. They do contest, however, the ability to decide
the substantial-risk-of-serious-harm question “in one stroke,” Wal-Mart, 564
U.S. at 350, in light of the various heat mitigation measures that TDCJ makes
available to Pack Unit inmates.
      Specifically, Defendants assert that the efficacy of TDCJ’s heat-
mitigation measures to reduce the risk of serious harm to a constitutionally
acceptable level will largely depend on the age and health of each particular
individual—for the young and healthy, they may; for the old and sick, they may
not. And because the Pack Unit inmate population is diverse in both age and
health, it is impossible to determine all at once whether the excessive heat in
the Pack Unit “constitutes a condition of confinement that poses a substantial
risk of serious harm to the health of all inmates.” So, Defendants assert that
in order for this question to be “common” for Rule 23(a) purposes Plaintiffs
were required to prove “that even the youngest, healthiest, and most
acclimatized inmates face a substantial threat of serious harm despite TDCJ’s
existing heat-mitigation measures.”
      The district court made precisely this finding. It acknowledged that “[n]o
two individuals have the exact same risk.” Nonetheless, it concluded that this
“obvious fact [does not] destroy[ ] commonality” because “[t]he evidence calls
into serious question the adequacy of TDCJ’s mitigation measures—as applied
in practice—in reducing the heat risk for all the inmates, and particularly those
with comorbidities that diminish their ability to thermoregulate.” In other
words, the district court found, based on the expert testimony, that TDCJ’s
heat-mitigation measures—more frequent showers, cold drinking water, fans,
and temporary access to air-conditioned “respite areas”—were ineffective to
reduce the risk of serious harm to a constitutionally permissible level for any
inmate, including the healthy inmates, and the Defendants concede the
existence of a common question under these circumstances. Thus, in order to
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                                        No. 16-20505
prevail, the Defendants must demonstrate that the district court’s factual
finding is clearly erroneous. 4
       “A finding of fact is ‘clearly erroneous’ only when although there may be
evidence to support it, the reviewing court on the entire evidence is left with
the definite and firm conviction that a mistake has been committed.” Westwego
Citizens for Better Gov’t v. City of Westwego, 946 F.2d 1109, 1118 (5th Cir. 1991)
(citing Campos v. City of Baytown, Texas, 840 F.2d 1240, 1243 (5th Cir. 1988)).
“If the district court’s account of the evidence is plausible in light of the record
viewed in its entirety, [we] may not reverse . . . even though convinced that had
[we] been sitting as the trier of fact, [we] would have weighed the evidence
differently.” In re Omega Protein, Inc., 548 F.3d 361, 367 (5th Cir. 2008).
       We conclude that the district court did not clearly err. The district court
personally toured the Pack Unit and held a four day evidentiary hearing,
resulting in thousands of pages of expert testimony and other evidence from
both sides related to the heat impact on the inmates in the Pack Unit. During
the hearing, Plaintiffs put forward two experts—Dr. McGeehin and Dr.
Vassallo—who testified regarding the inadequacies of the TDCJ heat-
mitigation measures. Dr. McGeehin was previously the lead scientist with the
Center for Disease Control (CDC) regarding health effects from extreme heat
and heat waves; he has over fifteen years of experience in this area. Dr.
Vassallo is a licensed physician and a recognized expert in the field of
thermoregulation and hyperthermia, with over twenty-five years treating heat
stroke and heat-related disorders. Dr. Vassallo has previously served as an



       4 Defendants argue that the district court stopped short of finding that TDCJ’s heat-
mitigation measures were ineffective as to all inmates by concluding only that the evidence
called their effectiveness into “serious question.” We conclude that the district court’s opinion
can only fairly be read as concluding that TDCJ’s heat-mitigation measures are ineffective to
sufficiently reduce the risk of serious harm as to all inmates.
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                                  No. 16-20505
expert witness in lawsuits challenging prison conditions, and this court has (at
least) twice upheld district court findings that relied heavily on Dr. Vassallo’s
testimony. See Ball, 792 F.3d at 593–94; Gates, 376 F.3d 339–40.
      Dr. McGeehin testified that while showers are helpful “for the short
term,” “giving a person a shower and then putting them back into a very hot,
humid environment has limited effect.” Likewise, Dr. Vassallo testified that
“taking extra showers” did not reduce the health risks of extreme heat to a
“statistically significant” degree. This conclusion was supported by peer-
reviewed studies included in the record, indicating that “[t]aking extra showers
or baths and using fan ventilation during a heat wave were associated with a
trend toward lower risk of death but were not statistically significant.”
      Dr. McGeehin’s testimony relied on peer-reviewed publications
indicating that while fans may have a mitigating effect, they are actually
counterproductive at higher temperatures: “Although fans provide a cooling
effect by evaporating sweat, fan use can pose a significant risk when the heat
index exceeds . . . 99 degrees Fahrenheit . . . because it serves to increase heat
stress by blowing air that is warmer than body temperature over the skin
surface.” He also indicated that the CDC does not recommend the use of fans
when the temperature is above 95 degrees Fahrenheit, which frequently occurs
in the Pack Unit. Dr. Vassallo likewise testified that “[f]ans are not protective
at temperature[s] [of] 90 degrees with the humidity of 35 percent or more.”
      As to air-conditioned “respite areas,” Plaintiffs also put forward evidence
calling into question the effectiveness of TDCJ’s air-conditioned “respite
areas.” For example, Dr. Vassallo testified that these respite areas are not “an
adequate plan to deal with the heat risk” precisely because they are only
temporary and so “the time [the inmates] are not in air-conditioning, they are
subjected to the temperatures at the Pack Unit which are risky and cause
harm, including sickness, morbidity and mortality.” Moreover, Dr. Vassallo
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noted that the harmful effects of excessive heat can begin to occur before an
individual might feel the need to go to an air-conditioned space: “Q. Is it
possible for someone to start having cognitive problems from heat illness before
they realize they need to go to air-conditioning? A. Of course.” Thus, according
to Dr. Vassallo, because Pack Unit inmates must take the initiative to go to an
air-conditioned respite area, they may not know they are in imminent danger
until it is too late, and, especially at night, prison officials are unlikely to notice
either. Finally, Plaintiffs offered affidavits from inmates in the Pack Unit
indicating that access to air-conditioned “respite areas” is not “on demand,”
and such rooms are often not available. The district court found these affidavits
credible on this point—a determination to which we owe significant deference.
See In re Omega Protein, 548 F.3d at 367 (“Findings based on the credibility of
witnesses demand even greater deference.”). As Dr. McGeehin observed, while
respite areas might theoretically be an effective measure, their effectiveness
depends on being available to inmates upon request. 5
       Both of Plaintiffs’ experts indicated that the conditions in the Pack Unit,
including the heat-mitigation measures, posed a substantial risk of harm to
the inmates. In her expert report, Dr. Vassallo stated that “[t]he current
measures used to mitigate these serious risks . . . are inadequate to sufficiently
reduce the serious risk of harm to the inmates.” Upon reviewing TDCJ’s most
up-to-date mitigation policy, Dr. McGeehin indicated that “it has some
improvements in it, but it still has major areas of concern.” When asked
whether “there [are] any really effective way[s], other than air-conditioning, to
mitigate the risk of heat at the Pack Unit,” Dr. Vassallo said, “No.”




       5 Notably, the district court could not determine whether an official policy regarding
respite areas exists because “the only policy or practice of allowing inmates to access respite
areas is . . . stated in an email, and cannot be found in a separate policy.”
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                                  No. 16-20505
      Defendants put forward the testimony of Dr. Means and Dr. Reiger, who
testified regarding the various factors relevant to an individual’s heat risk and
concluded that the heat-mitigation measures at the Pack Unit were effective
to reduce the risk of serious harm. Dr. Means is a former employee of TDCJ—
a defendant in this case—and is herself a defendant in related wrongful death
actions. The district court found that Dr. Means “was unable to directly answer
most of the questions by Plaintiffs’ counsel,” was “nonresponsive to questions
posed by [the district court],” and “appeared incapable of admitting to anything
she did not view as helpful to her side’s case.” Consequently, the district court
“found her to be biased and, frankly, unbelievable,” and therefore “[did not]
credit any part of her testimony.” Notably, Defendants do not contest this
finding.
      While Dr. Reiger testified that the heat-mitigation measures in the Pack
Unit rendered the risk of harm “quite reasonable,” this conclusion was
countered by the testimony of Dr. Vassallo and Dr. McGeehin, who, as already
noted, concluded that the various heat mitigation measures that Defendants
employ are of limited value in reducing inmate risk. Moreover, the district
court specifically found Dr. Reiger’s testimony less credible, given that he
consistently misremembered statements made by inmates regarding the
availability of respite areas. Such credibility determinations fall squarely
within the district court’s purview. See, e.g., Env’t Texas Citizen Lobby, Inc. v.
ExxonMobil Corp., 824 F.3d 507, 529 (5th Cir. 2016) (“[W]e are extremely
deferential to a district court’s assessment of witness credibility[.]”).
      Under the clearly erroneous standard of review, “[i]f the district court’s
account of the evidence is plausible in light of the record viewed in its entirety,
[we] may not reverse it even though convinced that had [we] been sitting as
the trier of fact, [we] would have weighed the evidence differently.” In re
Omega Protein, 548 F.3d at 367. Upon careful review of the record before us,
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                                      No. 16-20505
we conclude that the district court’s “account of the evidence is plausible,” id.,
and we are not “left with the definite and firm conviction that a mistake has
been committed.” See Westwego, 946 F.2d at 1118. Accordingly, the district
court did not clearly err in finding that TDCJ’s heat-mitigation measures are
ineffective to reduce the heat-related risk of serious harm below the
constitutional baseline.
       This being so, we affirm the district court’s conclusion that Plaintiffs
have demonstrated the presence of a “question[ ] of law or fact common to the
class.” Fed. R. Civ. P. 23(a)(2). As already noted, Defendants concede that
“[c]ommonality required Plaintiffs to prove that TDCJ’s existing heat-
mitigation efforts necessarily mitigated the risk of high temperature for all
class members or for none of them.” The district court found the latter to be
true and, again, that finding is not clearly erroneous. 6
                                      ii. Subclasses
       Defendants also challenge the district court’s certification of the two
subclasses. As noted, the district court certified a “heat-sensitive” subclass and
a “disability” subclass. The heat-sensitive subclass, like the General Class, is
asserting an Eighth Amendment claim. Likewise, the disability subclass


       6  The district court also concluded that whether “TDCJ officials were deliberately
indifferent to the risk posed to the inmates” was a separate common question. The Supreme
Court has determined that “for purposes of Rule 23(a)(2) even a single common question will
do[.]” Wal-Mart, 564 U.S. at 359 (alterations omitted) (quotation marks omitted); see also
Newberg on Class Actions § 3:20 (5th ed.). This holding is consistent with our prior decision
in Forbush v. J.C. Penny Co., Inc., 994 F.2d 1101, 1106 (5th Cir. 1993) (holding that Rule
23(a)’s commonality requirement is satisfied where there is “at least one” common question
of law or fact). However, a later decision of ours—Applewhite v. Reichhold Chemicals, Inc.,
67 F.3d 571 (5th Cir. 1995)—held that “class certification requires at least two issues in
common.” Id. at 573 (emphasis added). Given that we are bound under the rule of orderliness
to follow our earlier precedent, and must in any event adhere to Supreme Court precedent,
we reaffirm that Rule 23(a)(2) requires only that a plaintiff demonstrate at least one common
question of law or fact, notwithstanding Applewhite’s contrary holding. Accordingly, we have
no cause to assess whether the district court’s second asserted common question satisfies
Rule 23(a)(2).
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                                    No. 16-20505
asserts an Eighth Amendment claim, but also relies on a claim under the
Americans with Disabilities Act and the Rehabilitation Act. And, as noted, the
district court determined that both subclasses shared the common questions it
identified for the General Class.
      Defendants’ primary objection to subclass certification is similar to their
objection to General Class certification. They argue that the existence of a
substantial risk of serious harm cannot be collectively determined because the
risk of serious harm from excessive heat varies even among those with
conditions rendering them susceptible to heat.
      We reject Defendants’ challenge to certification of both subclasses. The
district court found that TDCJ’s heat mitigation measures are not effective to
bring the risk of serious harm below the constitutional baseline for any Pack
Unit inmate—which includes the inmates within the subclasses who have
some condition making them particularly susceptible to heat. In addition, the
district court concluded that the disability subclass had the “additional
common contention . . . that TDCJ officials failed to provide reasonable
accommodations to inmates suffering from disabilities that may impact . . .
their ability to withstand extreme heat.” We find no error.
                                         B.
                                         1.
      In addition to meeting the requirements of Rule 23(a), a plaintiff must
also demonstrate that a proposed class satisfies one of the criteria articulated
in Fed. R. Civ. P. 23(b). Here, the district court certified the classes under Rule
23(b)(2), which permits class certification where “the party opposing the class
has acted or refused to act on grounds that apply generally to the class, so that
final injunctive relief or corresponding declaratory relief is appropriate
respecting the class as a whole . . . .” Fed. R. Civ. P. 23(b)(2).


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                                  No. 16-20505
      It is well-established that “[i]nstead of requiring common issues, [Rule]
23(b)(2) requires common behavior by the defendant toward the class.” In re
Rodriguez, 695 F.3d 360, 365 (5th Cir. 2012); see also Casa Orlando
Apartments, Ltd. v. Fed. Nat’l Mortg. Ass’n, 624 F.3d 185, 198 (5th Cir. 2010)
(same). Thus, we have held that Rule 23(b)(2) certification is available if three
requirements are satisfied: (1) “class members must have been harmed in
essentially the same way”; (2) “injunctive relief must predominate over
monetary damage claims”; and (3) “the injunctive relief sought must be
specific.” Maldonado v. Ochsner Clinic Found., 493 F.3d 521, 524 (5th Cir.
2007); see also Perry, 675 F.3d at 845. The specificity element requires
plaintiffs to “give content” to the injunctive relief they seek “so that ‘final
injunctive relief may be crafted to describe in reasonable detail the acts
required.’” Perry, 675 F.3d at 848 (quoting Shook v. Bd. of Cty. Comm’rs of Cty.
of El Paso, 543 F.3d 597, 605–06 (10th Cir. 2008)).
      The Supreme Court has further expounded on Rule 23(b)(2):
      The key to the (b)(2) class is the indivisible nature of the injunctive
      or declaratory remedy warranted—the notion that the conduct is
      such that it can be enjoined or declared unlawful only as to all of
      the class members or as to none of them. In other words, Rule
      23(b)(2) applies only when a single injunction or declaratory
      judgment would provide relief to each member of the class. It does
      not authorize class certification when each individual class
      member would be entitled to a different injunction or declaratory
      judgment against the defendant.
Wal-Mart, 564 U.S. at 360 (quotation marks omitted) (citation omitted).
                                        2.
      In their second amended complaint, Plaintiffs request the following
injunctive relief for the General Class and both subclasses:
      Plaintiffs ask that the Court enjoin Defendants to maintain a safe
      indoor apparent temperature (e.g., maintaining a heat index of 88
      degrees or lower) inside each of the Pack Unit’s housing areas
      (calculated using the NWS heat index table), or enter other
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                                  No. 16-20505
      injunctive relief sufficient to protect the health and safety of the
      prisoners at the Pack Unit.
The district court concluded that the General Class and both subclasses
“easily” met the standard for Rule 23(b)(2) because: (1) “the conditions of
confinement [i.e., non-air-conditioned housing areas] apply uniformly to the
class of inmates as a whole”; and (2) “[o]ther mitigation measures, such as
providing ice water and fans, and the availability of respite areas, are similarly
applied uniformly to all the inmates.” For this reason, the district court
concluded that “[i]njunctive or declaratory relief . . . would be appropriate
respecting the class as a whole if an Eighth Amendment violation were to be
found,” whether “air-conditioning is indeed needed to cure the violation, or if
less drastic measures (such as ordering TDCJ to create and adhere to a more
definitive policy regarding respite areas) are shown to suffice . . . .”
      Defendants argue that certifying the classes under Rule 23(b)(2) was not
appropriate. In essence, Defendants contend that the district court’s order does
not “identify specific injunctive relief that could apply to the entire class or
subclasses” or “explain how [that] single form of injunctive relief—whether it
be air conditioning or something less—would necessarily be appropriate (or
not) for the entire class.” According to Defendants, the district court improperly
“assumed” that a single form of injunctive relief “would necessarily be required
for all class members or none of them.”
      The district court did not abuse its discretion. By its terms, Rule 23(b)(2)
looks to whether the defendant’s conduct applies “generally to the class.” Fed.
R. Civ. P. 23(b)(2). Rule 23(b)(2) does not require “common issues,” but rather
“requires common behavior by the defendant towards the class,” In re
Rodriguez, 695 F.3d at 365, such that “class members . . . have been harmed in
essentially the same way.” Perry, 675 F.3d at 845. Here, there is no serious
question that Defendants have engaged in common behavior that “appl[ies]

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                                  No. 16-20505
generally to the class[es].” Fed. R. Civ. P. 23(b)(2). All inmates, regardless of
age or health, are subject to the same policy on climate control (i.e., their
housing units are not air-conditioned), all have the same heat-mitigation
measures available to them (whether or not those measures are effective), and
all are (allegedly) harmed in essentially the same way—i.e., by exposure to a
substantial risk of serious harm because of exposure to excessive heat. Thus,
the same action/inaction by Defendants is the source of any injury for the entire
General Class and the subclasses.
      Defendants lean heavily on Rule 23(b)(2)’s requirement that “the
injunctive relief sought . . . be specific,” Perry, 675 F.3d at 845, and that there
be “content” given “so that ‘final injunctive relief may be crafted to describe in
reasonable detail the acts required.’” Id. at 848 (quoting Shook, 543 F.3d at
605–06). Few of our cases expound on the “specificity” requirement. In one—
Maldonado v. Ochsner Clinic Foundation—we held that Rule 23(b)(2)
certification was inappropriate where the plaintiffs sought to compel the
defendants to provide “mutually affordable healthcare.” 493 F.3d at 524–25.
There, we faulted the plaintiffs for not “identify[ing] any way to determine
what a reasonable or ‘mutually affordable’ rate is for the wide variety of
medical services offered by [the defendant].” Id. at 524.
      We find this requirement satisfied here. While Plaintiffs requested that
the district court “enjoin Defendants to maintain a safe indoor apparent
temperature” (which admittedly offers little content), they also identified
specific relief in “reasonable detail” that would fit this standard: “maintaining
a heat index of 88 degrees or lower.” The district court—of course aware of
Plaintiffs’ requested relief—identified air-conditioning as a remedy that
“would provide relief to each member of the class.” Wal-Mart, 564 U.S. at 360.
While the district court did not specify the precise temperature (as the
complaint does), Rule 23(b)(2) does not require that every jot and tittle of
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                                       No. 16-20505
injunctive relief be spelled out at the class certification stage; it requires only
“reasonable detail” as to the “acts required.” Perry, 675 F.3d at 848. For this
reason, this case is quite unlike Maldonado, where the requested injunctive
relief (the provision of “mutually affordable health care”) lacked any
meaningful content and provided no guidance. 7
       Defendants contend that the district court “fail[ed] to explain how a
single form of injunctive relief . . . would necessarily be appropriate (or not) for
the entire class.” It seems that Defendants take issue with the district court’s
failure to explain how air-conditioning as a possible remedy could provide
class-wide relief from injuries caused by excessive heat. The answer, of course,
is self-evident, and the district court did not abuse its discretion in declining to
state the obvious. And, in any event, the district court heard expert testimony
on this issue.
                                              C.
       Defendants also argue that the district court’s Rule 23(b)(2) certification
was prohibited by the Prison Litigation Reform Act (PLRA). The relevant
provision of the PLRA provides:
       Prospective relief in any civil action with respect to prison
       conditions shall extend no further than necessary to correct the
       violation of the Federal right of a particular plaintiff or plaintiffs.
       The court shall not grant or approve any prospective relief unless
       the court finds that such relief is narrowly drawn, extends no
       further than necessary to correct the violation of the Federal right,
       and is the least intrusive means necessary to correct the violation
       of the Federal right.
18 U.S.C. § 3626(a)(1)(A).




       7 The Plaintiffs are not seeking damages in this case, so there is no issue as to whether
“injunctive relief . . . predominate[s] over monetary damage claims[.]” Maldonado, 493 F.3d
at 524.
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                                  No. 16-20505
      The district court reasoned that the PLRA “does not prohibit[ ] class-
wide relief in this case” because it only “prohibits relief that is unnecessary to
correct the alleged Eighth Amendment violation.” So, while the district court
recognized that the PLRA’s restrictions on injunctive relief would later come
into play, it concluded that they were irrelevant to class certification.
      Defendants argue that a district court is required to take Section
3626(a)(1)(A) into account when undergoing its Rule 23(b)(2) analysis. The
rationale for this position is straightforward: Rule 23(b)(2) requires district
courts to determine whether a single injunction (or declaratory relief) could
remedy violations as to all class members; but, the PLRA limits the scope of
permissible prospective relief to that which is “necessary to correct the
violation of the Federal right of a particular plaintiff or plaintiffs,” id.
§ 3626(a)(1)(A); so, to be at all meaningful, a district court’s Rule 23(b)(2)
analysis should only take account of injunctive relief that the PLRA would
authorize it to award as a remedy. Defendants make this argument while
acknowledging that one of our sister circuits has already rejected it. See Shook
v. El Paso Cty., 386 F.3d 963, 969–71 (10th Cir. 2004).
      As is always the case when interpreting legal text, our task is to give
effect to the language Congress has enacted, not to read additional meaning
into the statute that its terms do not convey. See, e.g., Lewis v. City of Chicago,
Ill., 560 U.S. 205, 217 (2010) (“Our charge is to give effect to the law Congress
enacted.”). It follows that when a statute is silent with respect to a particular
subject, we will not construe the statute to nonetheless reach the matter.
Indeed, “[t]he principle that a matter not covered is not covered is so obvious
that it seems absurd to recite it.” Antonin Scalia & Bryan A. Garner, Reading
Law: The Interpretation of Legal Texts 93 (Thomas/West 2012). This is
especially true where the claim is that Congress has implicitly altered one
provision of law via another provision; in such cases, Congress “ordinarily
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                                  No. 16-20505
provides a relatively clear indication of its intent [to do so] in the text[.]” See
TC Heartland LLC v. Kraft Foods Grp. Brands LLC, 137 S. Ct. 1514, 1520
(2017).
      The text of Section 3626(a)(1)(A) plainly says nothing at all about class
actions or the requirements for class certification. Nor have Defendants
directed us to any other provision of the PLRA—or any other statute for that
matter—that would support applying Section 3626(a)(1)(A) at the class
certification stage. There is therefore no basis for engrafting Section
3626(a)(1)(A)’s requirements onto Rule 23(b)(2).
      In reaching this conclusion, we are mindful that Congress rarely seeks
to effect a fundamental change in law through circuitous means. “Congress . . .
does not, one might say, hide elephants in mouseholes.” Whitman v. Am.
Trucking Assocs., 531 U.S. 457, 468 (2001). Rule 23(b)(2)—unlike the PLRA—
does not require that the injunctive relief underlying the certification decision
(or ultimately awarded as a remedy) be the bare minimum necessary to cure
the violation as to each inmate. Applying Section 3626(a)(1)(A) at the class
certification stage would work a considerable restriction on the availability of
class action suits in the prison context. These lawsuits overwhelmingly involve
Eighth Amendment claims, which require proof: (1) that the inmate “is
incarcerated under conditions posing a substantial risk of serious harm”; and
(2) that the defendant prison official was “deliberately indifferent” to that risk.
See Farmer v. Brennan, 511 U.S. 825, 834 (1994). As is true in this case,
determining whether particular conditions pose a substantial risk of serious
harm or whether there was deliberate indifference will often depend on
characteristics that vary across a prison population. Imposing Section
3626(a)(1)(A)’s requirements at the class certification stage would pose a
substantial barrier to class certification in a significant number of prison
condition challenges. Absent some indication in the text of Section
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                                  No. 16-20505
3626(a)(1)(A), we cannot conclude that Congress intended that provision to
alter the well-established requirements of class certification sub silentio.
      Defendants’ argument is also in tension with our decision in Williams v.
Edwards, 87 F.3d 126 (5th Cir. 1996), where we held that the PLRA is not
implicated at all until the district court actually sets its hand to fashioning
injunctive relief. Williams involved a prison case that was certified as a class
action prior to the PLRA’s enactment. See id. at 128 & n.4, 133. The district
court had not yet awarded prospective relief, and so we determined that
Section 3626(a)(1)(A)—which only applies to prospective relief—“ha[d] yet to
be triggered.” Id. at 133. The same principle applies here. Because the district
court has not yet come to the point of awarding injunctive relief, “the provisions
of [Section 3626(a)(1)] have yet to be triggered[.]” Id.
      Relying on our decision in Ball v. LeBlanc, Defendants argue that the
PLRA categorically prohibits an injunction requiring that the Pack Unit be air-
conditioned. This is not so. In Ball—which was not a class action case—we held
that a permanent injunction requiring that a prison facility be air-conditioned
was overbroad under the PLRA because the evidence produced at trial showed
that “there [were] many acceptable remedies short of facility-wide air
conditioning” that could possibly cure the Eighth Amendment violation. 792
F.3d at 598–99. In other words, Ball held that air-conditioning was not
appropriate in that case because other acceptable and less-intrusive remedies
had yet to be tried—not that air-conditioning was necessarily an impermissible
remedy. Id. at 599. We also held that a facility-wide injunction was not
appropriate under the PLRA because only the three named plaintiffs were at
issue. Id. at 599–600.
      Neither of these holdings precludes class certification here. Just as in
Ball, if Plaintiffs obtain a favorable judgment at trial and it appears that air-
conditioning the Pack Unit “extend[s] . . . further than necessary to correct the
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                                        No. 16-20505
violation,” 18 U.S.C. § 3626(a)(1)(A), the district court would be required to
tailor any injunctive relief to adhere to the PLRA. As the district court noted,
“[i]f an Eighth Amendment violation is found, this Court will need to determine
whether air-conditioning the housing areas is indeed the least intrusive means
of correcting the violation, or whether augmenting the mitigation measures
that are already in place at the Wallace Pack Unit would be sufficient to
remedy the violation.” Nothing in Ball, however, requires the district court to
make this determination at the point of certifying a class, and we do not pass
judgment on the issue either. 8
       We hold that Section 3626(a)(1)(A) does not alter the requirements for
certifying a class action under Rule 23(b)(2).
                                              IV.
       Accordingly, because we conclude that the district court did not abuse its
discretion in certifying the General Class or the subclasses, we AFFIRM.




       8 The Defendants also cite to Gates v. Cook. In Gates, which was a class action case,
the district court entered an injunction requiring, inter alia, that the defendant “provide fans,
ice water, and daily showers when the heat index is 90 degrees or above . . . .” 376 F.3d at
339; see generally id. at 339–40. Of course, just because Gates affirmed a different injunction
on a different record does not speak to whether the Plaintiffs’ requested relief in this case
would be permissible under the PLRA.
                                              24
