drug use and visitation

What is the name of your state? Alabama
My ex husband and I divorced app. 6 years ago. He was too busy doing Crystal Meth to deal with a family. My son was 18 mos. and my daughter was 3 mos. when we divorced. Since we was doing drugs the judge said that he couldnt have any visitation. (yeahhhhhhhh) Anyway, for the past 6 yrs he has been in and out of trouble. I have tried to be nice and when I thought he was off of drugs ( I swear he has spouted that he has changed more times than I have changed diapers on my kids) I would let him see my children. All in all, he may have seen them about 25 times in the last 6 yrs. And that may be an over-estimated guess. He has been in jail for the past year, and was released at Christmas. He came to my house to see the kids (while I wasnt there) My mom was there and didnt know what to do, so she let him see them. While he was there, a bottle of medicine came up missing. (my mom had just had surgery on her hand) When I found out he was there I came home from work and told him to leave. (not in front of the kids) Anyway, I have went above and beyond to help him get his child support adjusted. but he is 84,000 dollars behind. (Yes that is right, 84,000 dollars**************this is not a typeo) But, I dont want his money. I want him to leave me and the kids alone. His mom is calling me and cussing me out because I am making her come to my house to see the kids because I dont trust her to not let him see them. She cant see why I dont want him to see the kids****************************.....um maybe because I believe he is still on drugs. His dad and his step mom and I have a good relationship, but they also know my rule about my childrens natural father. ANyway, to get to my question, what are the chances of a judge letting him have visitation with my children with him I think still doing drugs. He is showing signs of drug use. 1.) open sores 2.) talking all of the time. 3.) NOt thinking clearly.

I dont want my kids around him, I dont want my kids to touch him. He cant handle the responsibility of a car, he cant even handle a drivers license. He lives in a run down trailor with a man who is known for his drug use in the past.

What can I do? BTW: His mom hasnt seen the kids in 6mos. not because I am keeping them from her, I told her she could come to see them anytime she wanted (as long as I was home). But that I wasnt going to drive to her house with my kids so she could see them.

So, basically everyone is making my life a living heck. WHAT CAN I DO??????????????