My son‘a dad is selling Xanax

I went to talk to my kid’s dad yesterday to discuss settling custody.

He basically told me his mom is the one trying to get my kids and the one who took my son’s baby stuff. Instead of discussing custody he started in on me giving him another chance. While he was talking he got a text from someone asking if he had anymore Xanax. And he told me he “used” to sell it. But decided to stop. I have no proof other than what he said.

I already knew he wasn’t good at making decisions but holy freaking crap. Don’t want my kids around him. Idk what to do. 😞

He has a prescription for the Xanax for his anxiety