Husband took drugs

We have a 4 month old baby and I have just found drugs in the house!

I took our baby away for a few days to visit family and have just found out that whilst I was away that my husband was drinking and taking cocaine. He forgot where he put it and I have just found it behind the baby's bath toys in the bathroom!!

I am fuming! We aren't speaking as I don't want to argue but this is such a bad atmosphere for our baby and I don't know what to do!

I want the best for my baby and can't believe he has done this to us.

What would you do if you were in this situation??