Texas DWI: Ignition Interlock

Last reviewed: 2026-07-17

IID mandatory as a bond condition for repeat DWI and DWI 0.15+; mandatory on occupational licenses after alcohol-related suspensions; mandatory during first-offense deferred adjudication. No general post-reinstatement IID period for a bare first conviction.

By offense

• First offense: IID not required at this level — Required if BAC 0.15+ as bond condition and for deferred adjudication.
• Second offense: IID required
• Third offense: IID required

Statute: Tex. Code Crim. Proc. art. 17.441; Transp. Code § 521.246