Do they drug test family members before placing with them?

Today I am attending the Team Decision Meeting for Little D (has been with us almost 3 weeks). We have met biomom for 1 visit and Aunt has had two visits. Biomom is a mess and just doesn't seem interested in getting custody of her son. The aunt actually seems pretty normal and we actually kind of like her. However, I suspect they BOTH are into smoking marijuana. We saw some tattoos that give this notion away. I think this Aunt we met is the most likely person they will place Little D with. Does anyone know if the agency drug tests family members before they place with them? This family has a history with CPS...a history that includes drug abuse. Again, we like this aunt, but we just get that gut feeling she has an "extracarricular" lifestyle.