Undercover Colors: Not a nail polish but Raleigh company introduces date-rape drug detector

Four years after its story went viral, Triangle chemistry startup Undercover Colors has a prototype - one its executives think can thwart sexual assault. It's not, however, a drug-detecting nail polish as initially envisioned. Instead, it's a single-use disk the size of a coin, one that can clip onto the back of a cell phone or a key chain. To use it, you pop it off, peel off a film and dip it into a drink, the results materializing in the form of one or two lines, similar to a pregnancy...