There are tons of reasons. Someone could have interpreted something someone said as meaning something...then things spiral out of control, and they find their stash...or possibly even for some reason they could have drugs that aren't there's. Maybe they took them away from someone. There are a million and one possibilities that happen all the time that it could be. Or...one of them could be guilty of one or all of the charges... Some of the most revered people in history were blatantly fucked up.