One other thing...the jails will use whatever is the least expensive. I'm guessing that since it's an older drug, it is probably very cost-efficient. Unfortunately, the jails don't put you on the BEST medicine, they will put you on what they have.
I don't know about it being addictive, but I know that most people on it can't stand it because it really slows you down...they call the way people walk when they're taking it "thorazine shuffel". I don't agree with them putting her on it (just my opinion) but I know how jails work. I know when I was locked up, I was put on prednisone for my back (history of ruptured disc) and prednisone makes me EVIL. I told them they had to put me on something to calm me down, and I was put on vistaril, which took the edge off. I don't know of any prisons who use xanax, ativan, or any of the newer "nerve" medicines...both because of the cost and the addictive potential.
Hugs and prayers!
Amy