Ex Smoking With Teen Daughter

Location: Michigan

I am in Michigan where marijuana is legal if you’re of age. My ex and I were never married. My daughter is 15 and I have sole legal and physical custody of her with “reasonable parenting time” being what is outlined in our child support agreement (no specifics). She typically goes every weekend, although she recently started a job and is working most weekends, so it hasn’t been as consistent.

My daughter confided in my other daughter (different dad) that last month, her and her dad and her dad’s friend were sitting on their porch and the two adults were smoking a pen and her dad handed it to her to use. She said she took one hit of it and started coughing hard, needed her inhaler, etc. I asked her if she was high, she said yes. Showed me a video of the aftermath where she is clearly stoned and then you can see her dad in the back laughing and telling her to go to bed.

I am not anti-weed at all. But I absolutely am not okay with my 15 year old daughter using it, especially with her dad. She has a lot of mental health issues that we deal with, as well as a family history of addiction on both sides (I know, they say weed isn’t addictive, but my fear is she learns to enjoy the feeling and continues to chase that high, literally).

I don’t know where to go from here. I just found out last night. He has a long time girlfriend and two small children. They don’t know that I know.

I’m not sure if it’s worth going a legal route considering I already have custody, but I’m still required to giving parenting time? Police report? Cps? Leave it alone?

Thanks for any help!!