No amount of talking, arguing, testing or lie detecting will stop him from using cocaine. Only he can stop and he won’t because he doesn’t think he has a problem. You do.
What’s worse is they believe their own lies and will manipulate any situation.
We would all love our husbands to return to the men they were and not this substitute we are left with. You cannot help until he wants it.
Try to look after yourself and your family through all this. I know its hard but your health has to be looked after too. Keep strong.