. >> the hooker got hurt. but brian was fine. and no regrets about getting involved. the experience reminds him how violent prostitution can be. and he doesn't think most folks realize that. >> i get people all the time say, brian, why prostitution? why don't you go after the murderers? the drug dealers? the child rapists? why don't you go after those people? well, i'm here to tell you, those people are our prostitutes and our pimps and our johns on south robinson. these aren't pta moms making a few extra bucks. these are hardened criminals. >> out on his beat, bates has seen it all. armed robberies, drug deals and violent crimes. on this day driving his normal route, he witnesses another scary scene. >> i notice there's this group of black males surrounding this black female prostitute, and they're trying to force her into a car. >> a kidnapping. and unbelievably, it's happening right in front of him. >> and so i'm literally driving, 911 in one hand, camera in the other, and i'm steering with my knees, trying to get the evidence i need. and really, all that i can rem