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Ignition Interlock

Lower Breath Volume Sample for Medical Exemption
The minimum breath sampling size of an IID may be reduced to 1.2 liters for a device user with diminished lung capacity. Diminished capacity may be established through documentation from the appropriate judicial authority, advising of the necessity for the lower breath volume requirement. This documentation should be maintained in the manner required of calibration and maintenance records under the Texas Administrative Code §10.12 of this title (relating to Vendor Standards).

This policy is based on the Model Specifications adopted by the National Highway Traffic Safety Administration (NHTSA).

The Texas Transportation Code §521.2476 requires DPS establish minimum standards for vendors of Ignition Interlock Devices (IID) who conduct business in Texas and procedures to ensure compliance with those standards, including procedures for the inspection of a vendor’s facilities. To see a list of items that will be inspected, view audit checklist.

RSD staff certifies vendors to install, download, remove, repair, replace and make reports of all required data recorded by the device.

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