Forty-eight hours. The Center Against Rape and Domestic Violence says pimps often approach teenage girl runaways within just 48 hours of running away. Pimps go where they know runaways congregate—the mall, the movie theater, the train station—and then they lavish attention on the most vulnerable. From there, pimps convince young girls—and, sometimes, boys—to sell their bodies. It’s gross, and it works, and until now, it’s gone mostly unnoticed.