Good stuff Jabber!!
I agree with you 100%. For some jail is a good thing in that it can somewhat force sobriety but if they have their mind set on something they will figure out a way.
My son shared stories with me about how they were making what he called "hooch" which was some type of alcohol. He also told me that if he really wanted to get drugs he could.
He also shared how you either learn how to fight and take care of yourself or you will end up being someone's "girlfriend"
My son is 6'4" and well built. His size used to scare me when he would go into his rages but I was also grateful for his size knowing that he could defend himself.
When my son was in jail the various times I knew where he was and that brought me some comfort but I also knew that there were others that were teaching him how to be a better criminal. 
