"So I discussed with the Director letting my AS stay at my house AGAIN until Monday, and if he tests clean, he will go back to the SLE. If he tests dirty, he is out of both my house AND the SLE."
This is great...you have a plan. Make sure it is shared and clear and then execute according to your plan.
It seems to me you have established clear boundries....do what you need to and get the support you need to stick to your plan!
Hugs and Support,
cangel