Chances are even if you got arrested and charged you'll still be fine. You would need to pay a lawyer to plea you a suspended sentence, which is the norm for any minor drug/alcohol charge. All you have to do is stay clean for the time you are on probation and you will never technically be charged, basically the charges would be dropped. Therefore when you have a background check nothing will come up, and if you get asked "Have you ever been charged with any crimes?," you can honestly say "No.". This is second hand knowledge of course. Might be a different story if you're in pharmacy school. Moral of the story......misdemeanors are fine (not fine, but redeemable), felonies are not!