. >> federal prosecutor ed gallagher says a single woman can bring in thousands of dollars per nightor the cantinas. yet of the hundreds of trafficking victims he's encountered, he can't recall one who's ever kept any money. >> and the big money-maker, the greed that drives this, is the sex, the prostitution, is the number of tricks they can perform on a daily basis, putting the money earned into the pockets of those who are exploiting them. that's human trafficking. >> during her six years in captivity in mexico, wendy worked with schoolgirls from el salvador, guatemala and honduras. >> translator: almost all of them were 14, 15, 16 years old. all of them told me the same thing, that they had been tricked. >> wendy says that the traffickers ruled by daily beatings and terror. running was not an option. >> translator: one day i hadn't wanted to be with a client so i was drugged. the next day when i woke up, i wasn't able to get out of bed because of the beating. but the physical pain is nothing compared to what it does to your mind. >> wendy became compliant and reliable and for thre