Get this: Michael Vick can get up to a year knocked off his federal sentence for testing positive for pot.
...by taking advantage of an obscure Federal Bureau of Prisons (B.O.P.) Rotational/Developmental Assignment Program (R.D.A.P.) loophole — 18 U.S.C. 3621 to be exact — [Vick] could possibly reduce his sentence by one year...
From U.S. Code posted at Cornell Law School's site:
Period of custody — The period a prisoner convicted of a nonviolent offense remains in custody after successfully completing a treatment program may be reduced by the Bureau of Prisons, but such reduction may not be more than one year from the term the prisoner must otherwise serve.
The caveat is that is must be a nonviolent crime, but Vick's lawyer could make a legitimate case of that for Vick. Also, this does nothing for his pending state charges. I found the link to this at 100% Injury Rate, who confirmed this with someone from the website American Prison Consultants. They ask the question: is Vick some kind of criminal genius who has spent the last six months poring over his legal books, or a stressed out pothead? Probably the latter.