Delaware · DUI · Checked October 2026
Ignition Interlock Rules in Delaware
Ignition Interlock Rules in Delaware: What Are the Rules?
When Delaware requires an ignition interlock after a DUI.
- First offense
- Yes. Mandatory for all first offenders regardless of BAC for offenses on or after February 1, 2015. First offenders election: at least 4 months on the IID license. First conviction: at least 12, 17 or 23 months depending on BAC
- Repeat offenses
- Yes. Second: at least 16 to 28 months; third: 21 to 33 months; fourth or later: at least 54 months
First Offense in Delaware
Yes. Mandatory for all first offenders regardless of BAC for offenses on or after February 1, 2015. First offenders election: at least 4 months on the IID license. First conviction: at least 12, 17 or 23 months depending on BAC.
Repeat Offenses in Delaware
Yes. Second: at least 16 to 28 months; third: 21 to 33 months; fourth or later: at least 54 months
How the Program Works in Delaware
The court orders the interlock in addition to other penalties. The IID must be on a Delaware-registered vehicle. Contact the DMV IID Unit at 302-744-2540.
More on DUI Law in Delaware
See the full overview of DUI laws in Delaware and read about how ignition interlock programs work.
This page summarizes Delaware law from official sources, checked October 2026. It isn't legal advice; a lawyer licensed in Delaware can advise on your case.
Frequently Asked Questions
Is an Ignition Interlock Required for a First DUI in Delaware?
Yes. Mandatory for all first offenders regardless of BAC for offenses on or after February 1, 2015. First offenders election: at least 4 months on the IID license. First conviction: at least 12, 17 or 23 months depending on BAC.
Is an Interlock Required for Repeat Offenses?
Yes. Second: at least 16 to 28 months; third: 21 to 33 months; fourth or later: at least 54 months