A doctor who was sentenced to 33 years in jail for helping hunt down Osama bin Laden, had his prison sentence overturned by a local judge Thursday, NBC News reported. Shakeel Afridi was arrested for treason last year over his role in a CIA-backed fake polio vaccination campaign which he used to collect DNA samples from bin Laden and his family in order to prove the al Qaeda leader's whereabouts to U.S. authorities. Afridi was later charged and sentenced for alleged links to banned militant groups. The doctor filed an appeal, which was heard by judicial official Sahibzada Mohammad Anees in Peshawar, Thursday. Anees declared Afridi's sentence was incorrectly imposed and referred the case for re-examination.