From Nicholas D. Kristof at nytimes.com:
Jasmine Caldwell was 14 and selling sex on the streets when an opportunity arose to escape her pimp: an undercover policeman picked her up.
The cop could have rescued her from the pimp, who ran a string of 13 girls and took every cent they earned. If the cop had taken Jasmine to a shelter, she could have resumed her education and tried to put her life back in order.
Instead, the policeman showed her his handcuffs and threatened to send her to prison. Terrified, she cried and pleaded not to be jailed. Then, she said, he offered to release her in exchange for sex.