. >> reporter: the mix of men and money is bringing another playing to willston.s undercoverage footage reveals the under belly of the oil boom. >> wherever you have lots of men and lots of money, you are going to find prostitution and trafficking. >> reporter: wendy says there has been massive boom in prostitution and trafficking. why are you so passionate about this work? >> i have also experienced some things in my life. i was trafficked as a young child. started running away at a very young age. and wound upturning to a friend for help who was under pimp control. she introduced me to her pimp and i was under control that night. >> reporter: how often do you drive around at night? >> quite often, actually. >> reporter: she regularly visits prostitution hot spots to build relationships and help in any way she can. shelter, sympathy, even a ticket home. >> reporter: some of these hotels have floors bought out by pimps and girls are in those rooms. >> reporter: north dakota officials admit that women and children are being caught up in trafficking, but the chances

i'll punch in willston, and you go over here toes courts -- >> reporter: wendy says an influx of meney has fuelled prostitution. these are all the girls that showed up today, and this looks like dozens, four pages. but she was not just looking for prostitutes. >> oftentimes the underage girls will have their face covered. >> reporter: she is looking for victim of sex trafficking. >> reporter: i look for identifying marks like tattoos because a lot of the girls under pimp control are branded with their pimps game. >> reporter: she came here to fight the sex trafficking she says is the direct result of the oil boom. >> reporter: why are you so passionate about this work? >> first and foremost i'm a human being, and a woman, and i'm a survivor of human trafficking, i was trafficked as a young child. i wound upturning to a friend for help and she took me to a pimp. >> reporter: how often do you drive around at night? >> quite often actually. >> reporter: she regulately visits prostitution hot shots to build relationship ps and help where she can. >> this is a huge area for prostitution a