Authorities say increased penalties and enforcement have driven down the number of drunken driving arrests over the past three years.
According to records reviewed by the Denver Post, court filings for driving under the influence and driving while ability impaired have dropped by more than 5,000 to just over 26,000 cases.
Jefferson County District Attorney Scott Storey says more DUI checkpoints on Colorado highways are sending the message that people should not drink and drive.
A first-time offense carries a minimum of two days to a week in jail. Multiple offenses range from a minimum of 10 to 60 days in jail.