Transcript for New Warning Over Nationwide Jury Duty Scam
We're back now with "Gma" on the lookout. This morning, we take a look at jury duty scams. Hundreds of people around the country have been duped by calls threatening arrests. Clayton Sandell has the story. ? Normally, we do not make these phone kals. Reporter: It's called the jury duty scam. We just pro stood seed to the around. Reporter: Telling victims they failed to appear for jury duty. How do I fix this? I want to know how to fix it. Because I've never been in trouble before. Reporter: Undercover police officers in Virginia caught thieves allegedly masquerading as officers last year. The only way to avoid serving time is to pay a fine. It's a growing problem. Anyone who loses money to these scammers is one person too many. Reporter: Vick testimonies instructed to get a paypal account, or get a prepaid card, or asked to give up their debit card and P.I.N. Numbers. They play on our self-doubt. They know we all think, oh, maybe we did miss something. They're going to try to exploit that. Reporter: Police around the country telegram they've received hundreds of calls from victims. So many falling prey to the scam, the federal trade commission is issuing an urgent warning. 25-year-old grad student Ali says she was DUPD by a scammer, pretending to be a deputy from her local North Carolina sheriff's office. It wasn't until she realized her debit card was charged $806 that it was a scam. It was the first time I actually had that much money. Reporter: Don't take the bait. And scammers won't take you. For your money. The court system and the sheriff's department will never ever call or e-mail you and ask you for money. Period. Reporter: For "Good morning America," Clayton Sandell, ABC news, Denver.
This transcript has been automatically generated and may not be 100% accurate.