Possession of teh wacky weedz.
I know there will be some/many who disagree with my take and be happy with this no-nonsense...Auburn people shouldn't tolerate this type of behavior....good riddance approach. But IF...IF...this is the first problem Barbee has had with Shaq..and the possession just means he was caught with a satchel or a few joints, whatever (And not 5 pounds) then fuck kicking him off.
Again, assuming it is just a basic possession charge and there's no other circumstances making it much worse, then discipline the hell out of him, suspend him X amount of games, make him see the error of his ways (Not calling Snags to share) and get him back on track.