Ignition Interlock Restricted License

Photo of driver blowing into Ignition Interlock device
What is "Interlock?" An Ignition Interlock is a device that is installed on motor vehicles to prohibit individuals from operating a vehicle while under the influence of alcohol. It requires your breath sample before the engine will start and you are periodically required to provide breath samples while driving. If the device detects an elevated alcohol concentration level, the vehicle will not start. 
What does "DUI Per Se" mean?  § 42-4-1300.3.(3) C.R.S. defines "DUI per se" as meaning 'driving with a BAC of 0.08 or more, and use of the term shall incorporate by reference the offense described in section 42-4-1301(2)(a).'  
Important:  Legislation effective January 1, 2014, has significantly changed previous law involving alcohol violations, Persistent Drunk Drivers (PDD) and the Ignition Interlock program.  Those changes include:  
  • The reduction of the Blood Alcohol Content (BAC) on a chemical test from 0.17 to 0.15 to designate the driver as a Persistent Drunk Driver.  
  • The refusal of a chemical test at a traffic stop on or after January 1, 2014, will now result in a Persistent Drunk Driver designation.  
  • If a driver refused a chemical test prior to January 1, 2014, and was previously ineligible to reinstate early with Interlock, they may now either finish serving the remainder of their revocation and reinstate with full driving privileges, or serve at least two months and apply for early reinstatement with Interlock for one year.  They are not eligible for Financial Assistance in this case.   
  • If a driver has multiple alcohol violations or refusals on their record, the wait time for early reinstatement with Interlock has been reduced to one or two months, respectively. 


Any Interlock-restricted driver who either drives a non-equipped vehicle or attempts to circumvent the proper functioning of the interlock device is subject to a license revocation with no driving for at least one year.

The Interlock device must be serviced every sixty days. An Interlock-restricted driver who fails to report for device servicing is subject to a license suspension with no driving until that driver comes back into compliance. Any driver whose interlock lease is cancelled by the provider or before the driver’s requirement is completed will be suspended until the driver enters into a new lease agreement.
If the device prevents operation of the vehicle after detecting alcohol in three of any twelve consecutive months, you may be subject to suspension and additional time on your interlock requirement, up to one year for each set of three fails.

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