This scam is worst than a red zone interception.
The deals usually happen away from the stadium where unsuspecting buyers hand over their cash for fake tickets, said Chicago Deputy Chief Jim Keating.
Police suspect a band of scammers are targeting football fans on the web.
"The guys do not go by names; we're trying to connect the dots with e-mails and websites," Keating said.
The team also warns fans to watch out for faceless scammers.
"We want folks to go to Ticketmaster.com or on NFL Ticket Exchange online," said Lee Twarling, Bears ticket operations director. "When you buy on NFL Ticket Exchange, the bar codes are validated ... You can see who is the buyer and seller."
Here's how to spot fake tickets, according to police.
* Bogus seat numbers
* Spelling errors
* Different pictures of Bears players than real tickets
*Glossier than legitimate tickets