In “When A Witness Recants,” documentarian Dawn Porter gives voice to three innocent men who were scapegoated by America’s justice system. But “When a Witness Recants” is not just reflection through information regurgitation. “When A Witness Recants” brings human stakes to commentaries on a broken system, showing audiences three lives unjustly stolen by officials meant to uphold the law. But there’s a pièce de résistance to “When A Witness Recants.” A crucial witness, Ron Bishop, is featured as prominently as the HP3. Criminal documentaries typically wrap once the verdict is delivered, whereas “When A Witness Recants” advances the conversation.