Some places will pay for rehab, or you might have to pay back like a certain amount like 12 or 13.00 a month, your son would pay it back once he is out and working. Places like the courts send addicts to. Some are good, some not but people that don't have the means can find help for an addict. I know I did because I am not working and she was in a wonderful place. Good luck and you will get your son back if he really wants help.
Prayers for you and him