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Legislature hears audit showing 41% IID installation rate; pilots and outreach boost compliance
Summary
A JLARC audit found an estimated 41% installation rate for court‑ordered ignition interlock devices, with installation strongly tied to income; pilots in Yakima and Snohomish counties raised local compliance and highlighted cost, communication, and logistical barriers.
A legislative audit and multiple county pilots presented to the Washington Senate Transportation Committee on Feb. 5 concluded that fewer than half of drivers required to install ignition interlock devices (IIDs) complete the requirement and that low income is the strongest predictor of noninstallation.
The Joint Legislative Audit and Review Committee (JLARC) told the committee that its sample of about 66,000 drivers from January 2018 through June 2025 produces an estimated overall installation/completion rate of about 41 percent. "The legislative auditor concludes that half of drivers required to install ignition interlock devices earn less than $28,000 per year," JLARC staff said, and installation rates rose with income—from roughly 30 percent in the lowest band to about 74 percent among highest‑earning drivers.
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