Abu Ghraib prison was taken over by the Iraqi government after claims of abuse by U.S. troops . Former Sgt . James Smith served three years on his conviction . Lawyer said he did n't know it was illegal to use working dog to threaten detainees . Smith could return to military if conviction is overturned .
Former Sgt . James Smith served three years on his conviction . Lawyer said he did n't know it was illegal to use working dog to threaten detainees . Smith could return to military if conviction is overturned .