I feel for you sister. I to use to do drugs on occasion before the Lord freed me from that addiction. I had to come to the point where I really wanted God to take it from me so badly,
I fasted and prayed and God heard my cry and gave me the strength to quit. Praise God.
I think its all a matter of timeing, God has his time, and we have ours, some people just have to hit bottom before they want to change bad enough to seek the help that only God can give.
Our prayers do not go unheard, I would get as many people as you know to pray for your husbands eyes to be opened to what this addiction has done to him and his family, so that he will repent and seek God in a new and stronger way, and will change his addittion to drugs for an addiction to God.
Maybe you can get a pastor to visit him and talk with him while hes in jail, and maybe do a bible study with him to bring him closer to the truth, and change his heart.
Ive heard many testimonys of God freeing people from addiction, but it will take willingness and want on your husbands part for God to work in him.
With God, all things are possible. Dont give up, give it to God.
Bless you, I will pray for you. Hang in there sister!