Summary: DNA evidence broke ground by taking the uncertainty out of criminal convictions. But what was once a slam dunk to judge, jury and the public is increasingly under scrutiny. Today, unraveling genetic evidence. Plus, Marshall, Texas is not what you'd call an innovation hub, yet a quarter of the nation's patent cases are filed there. A reporter looks into why patent holders and trolls choose this sleepy town and its one powerful judge to settle their suits - fast.
