Colorado is auditing nearly 2,000 commercial driver's license holders who have non-domicile licenses, which are issued to people without permanent U.S. citizenship.

Colorado is now among the states under a microscope from the U.S. Department of Transportation, after several high-profile crashes involving drivers who couldn't understand road signs written in English.

"We had a series of different crashes across the country that involved what we call non-domicile CDL drivers. Some of them didn't even have a CDL," said Greg Fulton, president of the Colorado Motor Carriers Association.

Fulton said that includes crashes in Colorado, such as a 2024 crash on Highway 285. Ignacio Cruz Mendoza lost control of a semitruck he was driving without a valid U.S. CDL, killing Scott Miller . Mi

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