If you are arrested for drunk driving but not convicted, do you still need SR-22?

My brother was arrested for OWI almost a year ago but he wasn’t convicted because of some technicality. I asked him today when he would get his license back, and he said that he was going to wait until his insurance would not put him on SR22. I suspect his psycho wife is trying to keep him from getting his license back and told him some crap so he wouldn’t get it.