DNA typing -- the analysis of a biological sample for a person's genetic signature -- has led to the unprecedented exoneration of hundreds of wrongfully convicted people. And every day we hear stories about how police used DNA to capture a dangerous rapist or killer. Reading these accounts, it is hard not to think of DNA typing as an unmitigated good. Who can argue with a technology that helps catch bad guys and correct law enforcement mistakes? But there is a darker side to this story -- a version less likely to play out on dramatic television shows. In Inside the Cell, Erin Murphy shows how DNA typing can be subject to misuse, mistake, and error, and lead to a police state run amok