TLDR at bottom

My husband and I have had the same friend group for about 5 years. It is composed mainly of people we both have known for over 10 years; some that have come in recently, and it’s very intertwined. About 3 years ago my best friend, and her husband moved into an apartment with our mutual friend. Recently it has started to be a super hostile living space for all involved.

With everything that has been happening I had brought up that I hope our mutual friend is not using again as a lot of the behaviors he is showing are signs of addiction problems. My best friend confirmed that he has been using some serious drugs pretty much daily (she confirmed through a mutual friend of hers and our friend that I don’t know)

The twist is that our mutual friend comes to our house at least once a week and is always still his same old self. Considerate, sweet, a genuine good person. But the recent accusations have made my husband uncomfortable with him being around our house and kids (rightfully so).

I spoke with him about instead of jumping the gun and being accusatory that we should be supportive and ask if he needs help. Especially considering that he hasn’t told us he is using and he is still enjoyable to be around and acts normal around us.

But how do we really broach this topic safely and genuinely without making it seem like we are mad or accusatory?

TLDR friend is using hard drugs and we don’t know how to talk to him about it