GLENWOOD SPRINGS, Colo. -- Up to 300 drivers licenses issued in Glenwood Springs could be revoked following an alleged scam uncovered in October.

The Colorado Division of Motor Vehicles has sent letters to 310 people who may have gotten licenses through three people suspected in the scheme, said Dorothy Dalquist, a spokeswoman for the state Department of Revenue.

The letter told recipients they would have to reapply for a license or identification card before the cards were voided Dec. 19. The deadline was extended to Feb. 15 because so few people have responded.

Of the 310 letter recipients, 10 reapplied for licenses and 75 surrendered their licenses outright, Dalquist said.

A second letter will be sent to about 225 people who have not respond to the first letter.

Three people, including a DMV employee, are accused of selling licenses at exorbitant prices to undocumented immigrants who otherwise couldn't get them. The licenses, which normally cost about $15, allegedly were sold for $400 to $1,500.

Driving testers Virginia J. Escalante, 44, and her husband, Fernando C. Escalante, 32, both of Rifle, and DMV employee Patricia Jane Kay, 50, of Silt, have been charged.

Police allege that Kay falsified illegal immigrants' paperwork so that they could legally obtain a driver's license in Colorado and that the Escalantes also falsified driving-test results for the same recipients.

They were scheduled to enter pleas in January.

Since the investigation, DMV officials have scrutinized license outlets statewide, Dalquist said.

"We have to look at each of these centers individually," she said. "We'll come up with new guidelines and new reporting requirements."

The Department of Motor Vehicles has also been working on a policy that will begin next July in which the agency will review the backgrounds of first-time applicants before issuing a driver's license.

It is unknown if the DMV will take action against those who obtained illegal licenses, Dalquist said.