Baby testing+ for weed.

Okay so long story short my boyfriend of 2 years has a almost 2 year old daughter by another girl, we have an almost 9 month old together. We just went to court and got temporary joint custody because she took him for support. Well his daughters mother just had a baby not even 2 weeks ago and we had a DCS lady to show up to our house talking about how her mother got them called on her for smoking weed around them and her and her baby testing positive for it. Her 2nd baby is NOT my boyfriends, but what are they going to do..? This has nothing to do with US, only because he is her father, that’s why we were notified. NO RUDE COMMENTS please. Note, weed is illegal here and she and the baby tested positive when she had him.