>> you are under arrest for prostitution. >> we have seen anyone as young as 7 or as old as 75 years old. >> relying on the kind canness of strangers to free them from captivity. >> this is something i would never expect here. >> open the door. sheriffs office. open the door. >> while devoted public servants do their best to fight those who prey on the vulnerable. >> it is nothing but modern day slavery. >> msnbc presents "trafficked, slavery in america." it is a growing menace