I believe it is not a problem as long as its been 10 years since the end of his probation. if its been 5 years you are eligible for some sort of rehabilitated status but you better get on it if you want to take care of it by February. they let me in 3 years post dui probation w/ prior dui arrest but no conviction but, i think i got lucky. had to pay $200. There's a lot of info on web but its hard to find any one to talk to. good luck.