Most prisons in the US still have wieght rooms, many behavior therapists vouch for the positive effects resistance training offers. As for Cali, I didnt know they took them away, but I dont think it is a state wide thing. Even if one prison takes them away, others still use them.
lets not forget that just because your in prison, does not mean you dont have access to steroids. Many people have the misconception that you cant get illegal things in prison, and that is so far from the truth.
I don't do this for my family, my friends, women, accolades, pride, or ego. I do it for me and no one else, its just part of who I am.