I dealt with cps in California, I tore down my grow before they ever showed, deny deny deny... I think the cps worker was trying to bait me by saying if I had a card it was all good so long as the kids couldn't access the elicit drug, still deny deny deny....
Never got tested nor was I threatened with it. Keep your place clean, feed your kids, make sure they have a place to rest their heads, and don't spank them. If they know you smoke, tell them to deny deny deny... they will interview your kids if they are old enough.
Good luck such a shitty spot to be in, but you will get through it!!!
SH420