You asked the question "what do you think" so I'll tell you. As the offspring of a severe alcoholic I hope not. If it where once or maybe even twice I'd say have him contact an attorney. But 3 dui's in 3 years? Thats habitual. I know they say rehab works but in my opinion it just doesn't work. I know I'm gonna get razzed for this post but even though we have one heck a stupid governor here in Indiana, I'm hoping that even he'd say no. IMO, once an adict always an adict.
I would tell you're friend that if he really wants them back then he should go see an attorney and see if its possible.