To make money for Chris, she had sex with men who responded to ads he posted online — five to 10 times a day.
Austin police officers had enough training to recognize her as a potential victim and to alert their department's specialized trafficking team.
A probation officer knew to call them when Sarah went missing again.
He brought her favorite snack: hot fries and Gatorade.
Sarah told him she'd been staying in motels with Chris for weeks, mostly in Austin but also in Dallas and San Antonio.
She's small, even in her puffy winter jacket with the fur-lined hood.
Her hair is tied in a top-knot; tracks of smudged mascara darken her eyes.
She's there because she exchanged text messages with an undercover police officer earlier that afternoon.
He asked the price for "full service." She responded like she was supposed to: 0 for oral and vaginal sex.
"We want you to feel safe," a female police officer is telling her.