RALEIGH, N.C. - Undercover Colors, which is developing nail polish that's intended to thwart date rape, has just raised $3 million. The startup has been relatively quiet over the past two years, though co-founder Tyler Confrey-Maloney has confirmed the testing of a prototype. The product purportedly changes color when dipped into a drink mixed with a date rape drug. Cindy Whitehead, the former CEO of Sprout Pharmaceuticals, a female sexual health firm that sold to Valeant last year for $1 billion,...