Mereid, I've opened this post several times hoping that I would come up with something brilliant to say, but I can't.
Normally, my instinct and Al-Anon experience would lead me to say "any time someone who's on probation violates probation, report it, or you're complicit to any crimes he might commit as a result."
But I'm also a mother. And while I wouldn't hesitate to report my ex if he broke probation, I would be in the same quandary you are if it was my child.
I've got nothing -- but prayers and supportive hugs. It's a really difficult situation you're in.