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A California bill that would make ignition interlock devices mandatory for first-time DUI offenders is moving closer to becoming permanent law. Assembly Bill 1830, introduced by Assemblymember Cottie Petrie-Norris (D-Irvine), cleared the Senate Public Safety Committee on a 5-2 vote on June 3, 2025, and now heads to the full Senate for consideration.
If enacted, the measure would replace a patchwork of pilot programs that have been repeatedly extended since 2010. Currently, California requires ignition interlocks only for repeat offenders and for first-time offenders whose blood alcohol concentration exceeds 0.15%. AB 1830 would lower that threshold to any first-time DUI, regardless of BAC level, for a minimum six-month installation period.
“This bill consolidates years of overlapping and sometimes conflicting statute into a single, coherent framework,” Petrie-Norris told the committee. She noted that 35 other states already have permanent interlock requirements for all convicted DUI drivers, including first-time offenders.
Supporters, including Mothers Against Drunk Driving (MADD), argue the devices are proven to reduce recidivism. A 2023 study by the Insurance Institute for Highway Safety found that states with mandatory interlock laws for first offenders saw a 16% decline in alcohol-related fatal crashes. The California Highway Patrol also endorsed the bill, citing data showing that interlock-equipped drivers are 15% less likely to reoffend.
Opponents, including the California Public Defenders Association, raised concerns about cost and equity. Installation fees typically run $75–$150, plus monthly monitoring fees of $30–$80, which could burden low-income defendants. Some Republican lawmakers also questioned the severity of penalizing first-time offenders who may have had only a minor infraction. “Not every first-time DUI is the same,” said Senator Roger Niello (R-Fair Oaks). “A blanket mandate could be overkill for someone who blew just over the limit.”
The bill also includes a provision allowing courts to reduce the mandatory interlock period for offenders who complete alcohol treatment programs. That compromise was added to win moderate support.
With the 2025 legislative session entering its final weeks, the bill faces a tight timeline. If approved by the full Senate and signed by Governor Gavin Newsom, the law would take effect on January 1, 2026. Petrie-Norris’s office estimates the program would cost the state about $2 million annually for administrative oversight, but would save millions in accident-related costs.
As California debates the future of its DUI laws, the national trend is clear: more states are moving toward mandatory interlocks for all offenders. The question now is whether California will join them permanently.
