I was caught with 5.9 grams of marijuana. i live in iowa and was sentenced to unsupervised probation for a year,license revocation for 6 months,substance abuse classes,fines, and 31 hours in county jail. I have never been in trouble before and i was wondering if they will drug test me when i go in to do my 31 hours? and if they do test me and it comes up dirty will they hold me for longer than 31 hours? can they hold me longer than my release time? im really scared because i dont wanna spend christmas in jail. and please if you have negative or stupid comments dont bother with replying. thanks for the help.