Transcript for Counterfeit Super Bowl Tickets for Sale
With the super bowl just days away, a startling discovery. A lot of counterfeit tickets to the big game are being sold. Is there any way to catch them? ABC's gio Benitez, now, with the secret and the warning. Reporter: Fans, fireworks, and tonight, with the super bowl just days away, fakes. Bogus tickets seized overnight. They look so real, investigators believe they could've gotten someone into the stadium Sunday. There was some really advanced technology to make these tickets. Some of the most advanced counterfeiting techniques I've ever seen. Reporter: Take a look. This is a real super bowl ticket, side-by-side, with the fake one. They have the same artwork, the same foil-embossed logo, the identical watermark. So, how do you tell the difference? When you apply heat by rubbing it with your thumb or your hot breath, it will disappear. As soon as the ticket cools off, it will reappear again. Reporter: Every year, as many as 200 super bowl fans are scammed with fake tickets. They are sold online, and in person, on the streets before game. Vinny Pasculli, who bought a phony ticket for super bowl ticket two years ago for 1,9 bucks. You see something, you go for the real deal. Reporter: But as the counterfeits get more sophisticated so does the NFL. We're hopefully staying one step ahead of the thieves. Reporter: This year's tickets have about 15 secret high-tech markings that the NFL hopes ticket counterfeiters never find. And heads up -- 3,800 real tickets are still up for sale tonight. Gio Benitez, ABC news, New York.
This transcript has been automatically generated and may not be 100% accurate.