Ok...a guilty secret...I love to watch the Investigative Discovery Channel and (blush) on the weekends I watch "Lock Up" a real life show about real life people in jail and I did learn a few things from watching it.
Never listen to what anyone promises in juvy or jail oa any safe, locked in situation. It's the getting out and living that is hard. They all make the same promises in there. Some have support. Some don't. But they all say the same thing about never coming back, etc. etc. etc. They are done, blah, blah, blah. Then after the episode they flash the outcome, in which you are madly cheering for the inmate to have turned his life around.
Let's just say it usually doesn't last very long. Often it is as simple as just violating a simple parole rule.
Wait until your adult child is out of jail and see what he does. Remember "Actions Speak Louder than Words." Words are meaningless. They are not active. They are passive. As Yoda said in Star Wars (another guilty secret love of mine) "Don't Try! Do! There is no try!"
In the meantime, your son is pretty safe, off the streets, and I highly recommend you take some quality time to treat yourself like a queen and relax. You deserve it!!!! You EARNED it.
I am so sorry for your situation, but do make the most of it.