The most important part is that they will search his house, this includes any roommates/family members living there.
Also, if he lives in another area than the one he got busted in, he will have to be transferred. This is where they really fuck you, they can make you agree to all sorts of stuff or they will deny your transfer, in my case they made me agree to no firearms, drug abuse counselling, anger management. This is for misdemeanor possession only, nothing violent, no priors, no weapons. When my house got searched I got a shitload of trouble for several pellet guns that belonged to my roommate, but where in a common area. It sounds unbelievable, but they totally fuck you.