If your husband's dealer is busted, your husband will simply find another dealer.
And in the meantime, you AND your child might get very badly hurt.
For nothing.
You DON'T have to ignore his use. That's not what anyone here is saying. Is that what you're hearing?
And...rights? None of us has rights when it comes to addiction. It is a wanton killer and destroyer of families and lives. Allowing someone who actively uses heroin to live under the same roof with you and your child is opening you up to a world of trouble (including having your child taken away) ....and blaming his dealer won't improve things one bit.
I'm sorry to sound so harsh, but the harsh reality is that your only protection will be setting boundaries in your own home, and sticking to them. You are a prisoner in your own life, and I hurt for you. Heroin stole my sister from me and I know how futile it is to get angry and posture and flail around blaming everyone but the one who deserves the blame -- your husband.
Protect yourself. And if you won't do that, protect your child.