[Solved] Step dad concerned when dad dropped daughter back stinking of weed

There's no right or wrong way to approach this. I would suggest that the mother puts in writing to the father that if this occurs again, she will have no other choice than to consider stopping contact or that contact will have to become supervised.

If he won't agree or things deteriorate, she can try attending mediation with him to come up with a plan together. If that fails, she could make an application to the court.

Hopefully, something formal in writing should be enough to stop him smoking cannabis when the child is in his care.

The mother should talk to her husband about this matter. If her husband is smoking weed then she should warn him. She can file a petition in court to reduce visiting hours or even disallow him to meet with her daughter. You should take online relationship counseling as it's not safe for your daughter.

I’ve removed your link, little point as your based over the pond! Family law in the UK is different to that in US and Canada.

[censored], I also have a 5-year-old daughter, at first I thought that someone was complaining about me. I honestly can't imagine a situation where a child smelled like grass. We have fish at home and often this food stinks of grass, as if someone smoked at home. And maybe the father himself uses, but there are also medicinal herbs, cannabis, which is prescribed to many people to reduce pain symptoms or other ailments. It might just be a coincidence, but look what the law says. Perhaps my father leads a difficult life and is engaged in something illegal, although in my country such things are sold freely and even prescribed by a doctor.