Dance garment, c. 1900, Malawi (Chewa culture), Photograph by Kate Whitley. Copyright Te Papa MA_I.374711

You’ve probably seen forensic scientists on TV taking swabs and fingerprints from crime scenes. They aren’t wearing labcoats, hairnets and gloves to look cool but to prevent them contaminating their forensic evidence with their own DNA. But how do scientists deal with items that are already contaminated with unwanted humanRead more