Louisiana · DWI · Checked October 2026

Ignition Interlock Rules in Louisiana

Ignition Interlock Rules in Louisiana: What Are the Rules?

When Louisiana requires an ignition interlock after a DWI.

First offense
As a probation condition: no driving for at least 6 months unless the vehicle has an interlock; required during the whole suspension at BAC 0.20 or more, and for a restricted license during a 0.15+ suspension
Repeat offenses
Second offense: at least 6 months from conviction plus any suspension period; third offense: any vehicle the offender drives, until treatment and home incarceration are complete; a restricted interlock license is available after one year of the 36-month suspension

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First Offense in Louisiana

as a probation condition: no driving for at least 6 months unless the vehicle has an interlock; required during the whole suspension at BAC 0.20 or more, and for a restricted license during a 0.15+ suspension

Official source: first offense (Louisiana)

Repeat Offenses in Louisiana

second offense: at least 6 months from conviction plus any suspension period; third offense: any vehicle the offender drives, until treatment and home incarceration are complete; a restricted interlock license is available after one year of the 36-month suspension

Official source: repeat offenses (Louisiana)

How the Program Works in Louisiana

devices must comply with La. R.S. 14:98.5(C) and La. R.S. 32:378.2

Official source: how the program works (Louisiana)

More on DWI Law in Louisiana

See the full overview of DWI laws in Louisiana and read about how ignition interlock programs work.

This page summarizes Louisiana law from official sources, checked October 2026. It isn't legal advice; a lawyer licensed in Louisiana can advise on your case.

Frequently Asked Questions

Is an Ignition Interlock Required for a First DWI in Louisiana?

as a probation condition: no driving for at least 6 months unless the vehicle has an interlock; required during the whole suspension at BAC 0.20 or more, and for a restricted license during a 0.15+ suspension

Is an Interlock Required for Repeat Offenses?

second offense: at least 6 months from conviction plus any suspension period; third offense: any vehicle the offender drives, until treatment and home incarceration are complete; a restricted interlock license is available after one year of the 36-month suspension

Sources

  1. Ignition interlock

dui.help is an independent guide, not a law firm or a government agency, and doesn't give legal advice. For advice on your case, talk to a lawyer licensed in your state; your state bar can refer you, and if you can't afford a lawyer, ask the court about a public defender.