Can he be jailed and bailed out?
One thought that comes to mind is to let him get arrested, then talk to a live-in rehab facility where, if he agrees to go, then he can be bailed out to go directly to that facility.

In FL there are 21 days live-in facilities where the person after that is placed in a home for substance abuse people where they can live only if they get a job and actively participate in their 12 step program. United way funds most of them, so they are not expensive.

gab