with 1,000 milligrams of vitamin c and energizing b vitamins, it made every performance count. emergen-c. feel the good. prostitution is illegal in america with the exception of a few rural counties in nevada. cnn's amber lyon spent a year investigating the illegal trafficking of underage girls in america. it's a brutal trade, affecting type 300,000 american children. she went to america's most famous legal brothel, the moonlight bunny ranch. the women who work there do so freely and they make good money. but many do so freely but many are haunted by their past. ♪ >> welcome to las vegas. >> hi, honey. how are you? >> a lot of sexual trafficking going on in las vegas. >> reporter: dennis, called america's pimp master general and considers himself a businessman. >> hey! i love it.