They answer the call 24-7, often risking their own safety to rescue the sick and injured and rush them to the hospital. But some paramedics have been more predator than hero.

Over the past 18 months, at least 129 ambulance attendants across the U.S. have been accused of sex-related crimes on duty or off, an investigation by The Associated Press found. Some of them molested patients in the back of an ambulance.

"It's a dream job for a sexual predator," said Greg Kafoury, a Portland, Ore., lawyer who represents three women who were groped by a paramedic. "Everything is there: Women who are incapacitated, so they're hugely distracted. Medical cover to put your hands in places where, in any other context, a predator would be immediately recognized as such."

Across the U.S., emergency medical technicians have been accused in recent months of such crimes as rape, soliciting minors over the Internet and possession of child porn, according to an AP survey of the state agencies that oversee those professions.