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DENVER — A driver found guilty of his fourth DUI on Tuesday is the first person in Denver to be convicted of a felony under Colorado’s new law.

Matthew Allen, 40, was convicted of driving while ability impaired, his fourth or subsequent offense.

Allen faces up to six years in prison, but the new felony DUI law does not mandate jail time.

In July, a driver who was convicted of his fifth DUI in Arvada was sentenced to one year of work release and three years probation despite the new law.

Allen was pulled over just after 2 a.m. on March 17 near West Alameda Avenue and Lipan Street after a Denver police officer saw him cut off an ambulance, prosecutors said in a statement Tuesday.

He was arrested and charged under the felony DUI statute when it was determined he had three previous drinking and driving convictions dating to 2004, prosecutors said.

Allen is scheduled to be sentenced on Jan. 19.