hmmm...doesn't sound like a good solution, cambi.
surely, there is somewhere else he can stay...like with his family or with friends or hey, he could check into a youth hostel..
look, he picked that roommate...this is probably just the beginning of his errors in judgement which will continue to cause mayhem in his life.
i would definately re-think taking him in. you could just tell him you can't handle it right now. you did just move out afterall. and let him find his own solution. he made the mess, let him clean it up.
if not, i feel you might end up with a situation on your hands. for example, he fails the breathalyzer (which is quite likely)...you tell him to leave...he says no.
sounds like a recipe for disaster to me.