Tens of thousands of people get bone marrow transplants every year for blood cancers and other blood diseases including leukaemia, lymphoma and sickle cell anaemia. Although it’s unlikely that any of them would end up as the perpetrator or victim of a crime, the idea that they could intrigued Long’s colleagues at the Washoe County Sheriff’s Department, who have been using their (totally innocent) colleague in IT as a bit of a human guinea pig.