
515 F.Supp. 1149 (1981)
UNITED STATES POSTAL SERVICE, Plaintiff,
v.
N. STIMPSON, Defendant.
No. GCA 81-0023.
United States District Court, N. D. Florida, Gainesville Division.
May 29, 1981.
*1150 Clark C. Evans, U. S. Postal Service, Memphis, Tenn., Lyndia P. Kent, Asst. U. S. Atty., Northern Dist. of Florida, Tallahassee, Fla., for plaintiff.
Grafton B. Wilson, II, Gainesville, Fla., for defendant.

MEMORANDUM OPINION
HIGBY, District Judge.
Title 39, United States Code, Section 3005(a), allows the Postal Service to return mail to the sender if it finds the recipient of the mail "is engaged in conducting a scheme or device for obtaining money or property through the mail by means of false representations ...." The Postal Service alleges Ms. Stimpson is conducting a scheme for obtaining money through the mail by means of false representations and has sued under Title 39, United States Code, Section 3007(a), for a preliminary injunction directing the detention of the Defendant's incoming mail by the Postmaster pending the conclusion of the administrative proceeding. The plain words of Section 3007(a) require only "a showing of probable cause to believe" Section 3005 is being violated in order to obtain a preliminary injunction. United States Postal Service v. Beamish, 466 F.2d 804 (3d Cir. 1972). The reference in Section 3007 to Federal Rule of Civil Procedure 65 "intends merely to delineate the procedural mechanics applicable to the hearing on probable cause, the notice requirements and the form of the order." Id. at 806.
The hearing in this case was originally billed as a hearing on a petition for a temporary restraining order. The Defendant had adequate notice, four days, of the hearing. Consequently, with the Postal Service's approval, the hearing will be treated as a hearing on a motion for preliminary injunction.
To prevail the Postal Service must establish probable cause to believe Ms. Stimpson "is engaged in conducting a scheme or device for obtaining money or property through the mail by means of false representations ...." 39 U.S.C. § 3005(a). Probable cause is a familiar phrase in the law's lexicon. It has been judicially interpreted since the adoption of the Fourth Amendment. A finding of probable cause may rest upon evidence which is not admissible in a trial. Purely conclusory allegations, however, will not do. United States v. Ventresca, 380 U.S. 102, 85 S.Ct. 741, 13 L.Ed.2d 684 (1965). Probable cause consists of facts and circumstances based upon reasonably trustworthy information which are sufficient to justify a person of reasonable caution believing that an act has occurred or is about to occur. United States v. Preston, 608 F.2d 626 (5th Cir. 1979). See also, United States v. Johnstone, 574 F.2d 1269 (5th Cir. 1978) (mere suspicion does not constitute probable cause); Alsop v. Lidden, 130 Ala. 548, 30 So. 401 (1901) (the facts must be ones which would justify reasonable and cautious people in believing an act has been committed by a specified person).
The Postal Service relies primarily upon Ms. Stimpson's classified advertisement and follow-through brochure as probable cause showing her use of a scheme to obtain money through the mail by means of false representations. The ad and the brochure are appended to this opinion. The ad simply gives an address to write for information about earning money processing mail at home. The follow-through brochure which promises to pay a participant $.60 for each envelope secured, stuffed with Ms. Stimpson's circulars, and submitted to her according to her instructions. It speaks in glowing, optimistic terms of the financial and personal rewards available. A $25.00 deposit *1151 is required for the instructions. The final paragraph exhorts the reader to start now because the quota for mailers may soon be filled.
The Postal Service has alleged and attempted to prove probable cause that four representations are false: (1) immediate participation and reward, without further substantial financial investment; (2) only a limited number of persons will be selected to participate; (3) principal requisites for the participant's earning significant compensation are only payment of the deposit and stuffing of the circulars into the envelopes; (4) earnings are primarily determined by the amount of time participants devote to the enterprise. The Postal Service has not shown probable cause that any of these statements are false.
Ms. Stimpson's system as detailed in the extensive booklet provided those who ante up the $25.00 deposit requires a participant to place classified advertisements asking newspaper readers to send for information about earning money compiling mailing lists or typing at home. The Postal Service has not presented evidence indicating the additional costs of the classified advertisement would be substantial. It in fact relies upon Ms. Stimpson's estimate of $10.00 weekly advertising cost which could not be deemed substantial especially since the Postal Service has presented no evidence tending to show the rewards for diligent envelope stuffers will not be as touted.
The brochure's final teaser urging readers to join immediately because the quota for mailers may be filled is of a sort commonly seen in many advertisements. The statement is not phrased so that it would reasonably lead a reader to believe the limit upon participation is significant.
The Government has also not shown probable cause that the payment of the deposit and envelope stuffing are not the major prerequisites to success in their enterprise. And it has not established probable cause that diligence on the part of participants would not result in significant rewards. It in fact presented no evidence showing Ms. Stimpson's system does not deliver the promised rewards.
In fact the Government's evidence indicates Ms. Stimpson may have many happy customers. Ms. Stimpson is presently receiving approximately 84 pieces of mail a day. In the past month the Postal Service has received 36 inquiries about her operation. Thirty-six inquiries out of approximately 2,520 mailings is a very low complaint ratio. The Government has certainly not presented evidence indicating the ratio is abnormally high.
The Government's failure to show probable cause in this case is dramatized by comparison to cases where probable cause has been found. For instance, in United States Postal Service v. Peak Laboratories, 389 F.Supp. 228 (N.D.Ga.1975), the showing of probable cause included evidence that "FAT OFF" advertised as, among other things, causing a 30% decrease in the average cholesterol level of the average person and actually dissolving fat, would have no noticeable effect upon a person's cholesterol level or obesity. The Postal Service showed in United States Postal Service v. Oriental Nurseries, 491 F.Supp. 1265 (S.D.Fla.1980), that a tree advertised as growing up to 14 feet in one season and 23 feet in two years would grow to 12 feet in one season in only the most extraordinary of occasions. That kind of evidence establishes probable cause of a scheme to defraud.
In this case the Government has not shown probable cause of a scheme to defraud. Its motion for a preliminary injunction has therefore been denied.

APPENDIX

EXHIBIT A
    GOOD PAY working from home,
    processing mail for us. No experience
    required. Part or full time.
    Start immediately. For info. and
    application send SASE to: Colfax
    Publications, Box 1135, Newberry,
    Florida 32669.            1-22-6t


*1152 EXHIBIT B

*1153 
