. >> reporter: eric mcloughlin is with the customs enforcement department.-profit organization called preda which has been gathering evidence for months. >> it's my job to determine if the allegations are accurate. if they are accurate we will hold them accountable. >> reporter: we want to meet benjamin and see for ourselves what is going on inside that bar. so producer alex waterfield and i put on these tiny hidden cameras that look like shirt buttons and head down to a run down part of town to benjamin's bar and don't know what to expect. around a dozen young women are milling around, including this one. what is your name? >> princess. >> reporter: princess is one of the most popular girls in the bar. she is just 16 years old. >> do you like to pick them up? >> reporter: it's not long before princess and another girl are offered to us. 1500 pesos. just under $40. mama lucy is called a mama-san. she manages the girls. we decline her offer but she calls benjamin to come meet us. >> come sit at the bar so we look -- >> within minutes the 6'6" texan tells us a