My son is not quit 17 and I feel the same way as you. His last home visit, he stole a hidden and forgotten about RX of mine, stole 15 of them, taped them to his leg and snuck them into the program. This was all done under a watchful eye on him too. He was then kicked out but was given a "second" chance after a lot of pleading by me, only to get kicked out again in less then a month.
I have the choice to lock up everything, play warden with a lot anxiety or take him to dinner and a movie. (He refuses to go back to our church now because of something he did and doesn't want to own).
It breaks my heart that I feel this way but I have to think of my own sanity too.
P.S. To add to my guilt, the staff is "encouraging" me to allow him to come home for the day. ughhhhhhh