What do you do when you feel DCFS isn't doing enough?

I have a professor who has a student in her elementary school classroom that she believes is exposed to narcotics. DCFS has gone in and interviewed the parents to make sure however they have told the parents when they are coming in advance and they have stated that they don't think the parents are exposing their child to anything harmful. Meanwhile the stludent is coming to class everyday looking pale, dark sunken eyes, and constant sick. She will find him sometimes laying in the hallway in a ball because his stomach hurts so bad. So whether it is eposure to something harmful or something different, there is obviously something going on. But DCFS won't do anything more. What would you do?