Irritated Mother

I am from Texas. I was divorced from ex-husband in Sept. 2005. He had not seen my son since Feb. 2005. It has been 3 years since he has seen my son. He owes $4800 in back child support. He has never had any insurance on my son. He has never given me change of address nor telephone the several times that he has relocated. He has been caught selling cocaine. He has been seen using cocaine. He had even offered it to my fiance. Recently he has contacted me and now wants to start seeing my son.

You didn't ask a question - but I am going to guess you want to know if you have to let the father see the child...
Do you have a custody agreement from the divorce? You need to allow him access to the child as stated in the order - regardless of payment of child support.