                           UNPUBLISHED ORDER
                        Not to be cited per Circuit Rule 53




           United States Court of Appeals
                            For the Seventh Circuit
                            Chicago, Illinois 60604

                            Submitted October 26, 2006*
                            Decided November 22, 2006

                                     Before

                 Hon. FRANK H. EASTERBROOK, Circuit Judge

                 Hon. MICHAEL S. KANNE, Circuit Judge

                 Hon. TERENCE T. EVANS, Circuit Judge

No. 06-2305

GARY DeWILLIAMS,                            Appeal from the United States District
    Petitioner-Appellant,                   Court for the Western District of Wisconsin

      v.                                    No. 06-C-044-S

RICARDO MARTINEZ,                           John C. Shabaz,
     Respondent-Appellee.                   Judge.

                                    ORDER

       A federal prison guard found an “unauthorized electrical hook-up” hidden in
the light fixture in inmate Gary DeWilliams’s cell. DeWilliams and his cellmate,
Kenneth Reed, were both charged with possessing the electrical hook-up. The
evidence at DeWilliams’s subsequent hearing before a Disciplinary Hearing Officer
consisted of written statements from the guard who found the device and the
Bureau of Prisons employee who investigated the incident, a photograph of the
electrical hook-up, and DeWilliams’s testimony denying knowledge of the device and
stating that he only recently had moved to that cell. DeWilliams was found guilty

      *
         After examining the briefs and the record, we have concluded that oral
argument is unnecessary. Thus, the appeal is submitted on the briefs and the
record. See Fed. R. App. P. 34(a)(2).
No. 06-2305                                                                   Page 2

of possessing a hazardous tool (a similar device had been used to shock a prison
employee a year earlier), and his punishment included the loss of 45 days of good-
time credit. After exhausting his administrative remedies without success,
DeWilliams filed a petition in federal court under 28 U.S.C. § 2241, claiming that
his due process rights were violated because, he asserted, he was punished for not
accepting a deal to be an informant and was held in segregation for too long before
his hearing. In denying the petition the district court reasoned that the prison had
followed proper procedures and the hearing officer had based his finding of guilt on
“some evidence.”

       On appeal DeWilliams argues that he should not be responsible for the
electrical hook-up because, he insists, other inmates and the prison guards also had
access to the light fixture in his cell. For the BOP to revoke a prisoner’s good-time
credits, its findings from a disciplinary proceeding must be supported by “some
evidence.” Superintendent, Mass. Corr. Inst. v. Hill 472 U.S. 445, 455-56 (1985);
Piggie v. Cotton, 344 F.3d 674, 677 (7th Cir. 2003). Evidence of constructive
possession is sufficient to convict when contraband is found where only a few
inmates have access. Hamilton v. O’Leary, 976 F.2d 341, 345 (7th Cir. 1992).
Although DeWilliams now asserts that others may have accessed his cell, he did not
present any evidence at his disciplinary hearing to suggest that anyone else other
than his cellmate entered the cell or tampered with the light fixture, meaning that
a 50% probability exists that DeWilliams was the one who placed the electrical
device in the light fixture. A “50% probability amounts to ‘some evidence.’”
Hamilton, 976 F.2d at 345. Accordingly, we agree with the district court that the
hearing officer’s finding of guilt is supported by some evidence.

       DeWilliams, though, apparently argues that his disciplinary conviction
should be expunged because the identical charge against his cellmate, Reed, was
expunged on administrative appeal; DeWilliams argues that the BOP has adopted a
policy requiring across-the-board convictions when more than one inmate is charged
for the same conduct and no one accepts responsibility. As an initial matter,
DeWilliams cannot bring this claim under § 2241 because a prisoner seeking relief
under § 2241 must allege that the BOP’s decision is unlawful, not just that the BOP
made a mistake in implementing a regulation. Bush v. Pitzer, 133 F.3d 455, 456-57
(7th Cir. 1997). Moreover, DeWilliams never presented this argument either to the
BOP or to the district court. Hence, it is not properly before us on appeal. See
Richmond v. Scibana, 387 F.3d 602, 064 (7th Cir. 2004) (explaining that arguments
must be presented to BOP before they can be raised in § 2241 petition); Estremera
v. United States, 442 F.3d 580, 587 (7th Cir. 2006) (stating that it is well settled
that arguments not raised in the district court cannot be raised on appeal). And if
DeWilliams means to suggest that the final outcome in Reed’s case undermines the
evidence underlying his own conviction, he is wrong. Reed’s disciplinary conviction
was overturned because Reed presented credible evidence that he reported the
No. 06-2305                                                                   Page 3

electrical hook-up to a prison guard the day after he was transferred into the cell.
In contrast, DeWilliams had been living in the cell for over a month but had never
made a similar report. And although DeWilliams contends that he did not own the
hook-up, he was convicted only of possessing it—not owning it.

                                                                       AFFIRMED.
