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Ignition Interlock Device (IID) in Texas

Texas uses the term "DWI" for impaired driving offenses. IID requirement: required for high bac or repeat offenses. First offense scope: 6 months to 1 year (if BAC 0.15%+ or court-ordered). Confirm your actual notice and license status.

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Required for high BAC or repeat offenses

Quick Answer

Texas requires IID for DWI with BAC of 0.15% or higher on first offense, and for all second and subsequent DWI offenses. For standard first-offense DWI with BAC below 0.15%, IID is at the judge's discretion but commonly ordered as a condition of bond or probation.

IID Duration by Offense

OffenseIID Duration
1st Offense6 months to 1 year (if BAC 0.15%+ or court-ordered)
2nd Offense1 year
3rd Offense2 years
4th+ OffenseCourt-determined (typically 2+ years)

BAC threshold: 0.15% BAC for mandatory first offense; all repeat offenses. Judges commonly order IID for all DWI as condition of bond.

Confirm the device, provider and written quote

Check the responsible authority’s current approval information for the particular device and installer. Request the billing unit, included services, actual paid visit schedule, taxes, fees and removal terms in writing. Confirm financial assistance separately.

Add your own quoted charges in the IID worksheet. Unknown charges stay unknown; no local price or appointment count is assumed.

Restricted License with IID

Available

Texas allows an occupational license (also called an essential need license) with IID. The occupational license permits driving during specific hours set by the court for work, school, medical, and essential needs.

Tampering / Circumvention Penalties

Tampering with an IID in Texas is a Class B misdemeanor carrying up to 180 days in jail and a $2,000 fine. The IID period is extended and the occupational license may be revoked.

Early Removal

Texas may allow early removal at the court's discretion for offenders who demonstrate compliance. The judge must approve removal.

Texas-Specific Notes

Texas is the second-largest state and processes a high volume of DWI cases. While IID is not mandatory for all first-offense DWI, most Texas judges order IID as a condition of bond or probation, making it effectively required in practice even for standard first offenses. The occupational license with IID is the primary way to drive during a DWI suspension.

Frequently Asked Questions

Is an IID required for a first DWI in Texas?
Mandatory for BAC 0.15% or higher. For standard first-offense DWI (BAC below 0.15%), IID is at the judge's discretion but is commonly ordered as a condition of bond or probation. In practice, most Texas DWI offenders end up with IID.
What is an occupational license in Texas?
An occupational license (also called an essential need license) allows you to drive during your DWI suspension for specific purposes. The court sets driving hours and purposes. IID is often required as a condition of the occupational license.
How much does an IID cost in Texas?
Get a written quote for your vehicle and program. Confirm the billing period, included service, separately paid visits, taxes, state/program fees and removal charges. Verify any financial assistance before assuming a discount. A generic state price range is not your quote.

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Disclaimer: This is informational only, not legal advice. IID requirements, costs, and approved providers change frequently. Verify current requirements with the Texas DMV, your IID provider, or a qualified DUI attorney in Texas.
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Sources

NHTSA: interlock device and program background. This national reference does not verify every state rule above. Confirm the applicable law and current instructions with the authority named on your order or licensing notice.