We had a guy who was supposedly gone for 13 months come back in 05 and literally nothing happened to him because we needed bodies for an upcoming deployment.
Then there was another guy in 06 who got word of a piss test on a Monday morning after a normal weekend (which is admittedly strange). He'd smoked some weed and went UA that morning for a few weeks and returned before 30 days. He swore up and down that it was a coincidence and the 1stSgt and CO were just gonna NJP him but then the weed was still in his system and he popped anyhow.
I believe he was special court-martialed and BCD'd after spending some time in the brig.