I agree with the other ladies. I would have today be his last day. I understand you want to give him the 2 wks because this has been going on for a while and you haven't done anything as of yet. You are putting you, your dc kids and your children at risk.
If they "talk trash" about your daycare as a result, it sounds like anyone that knows this child will just smile and nod because they will know that he is the issue.