take me in to the mind of someone who attacks prostitutes. these they know of desperate, hooked on drugs, desperate for money to feed that addiction. >> the key word is vulnerability. with streetwalkers, sex workers they are always vulnerable but these women particularly because they needed money to support their drug habits. they admit it and talk candidly about it. three three types, angry, power and sadistic. sadistic is 5% of rapists and that's what this guy paul jackson is. he didn't just kidnap them. he put them in a truck, handcuffed them. took them to a place with bars on the windows, kept them for days an repeatedly raped them holding them in a soundproof closet and making them believe they would be killed. >> it usually happens in sadistic rapists who are serial killers. a lot of people have heard of