If you want to reduce the recidivism rate, stop drug testing as part of probation terms.  How many citizens end up back in jail because they smoked a bowl and then failed a subsequent pee test?  I know one man who went back to jail because he was caught drinking beer, which violated his terms of probation. That's backdoor Prohibition.  It's almost as if the state WANTS these folks back behind bars.  If they didn't then they wouldn't really care what you put in your body after serving out your sentence.