Board Thread:Naruto Discussions/@comment-28869806-20160507232833/@comment-28406729-20160508020534

I don't know, I always believed that since Sasuke was an international criminal, one of the conditions for him to be pardoned was that he'd remained with one arm, since he took away the 4º Raikage's arm in the Kage meeting. You know, an arm for an arm? xD

Anyway, I don't think he really needs the arm, it wouldn't make much of a difference.