Governor Jerry Brown signed SB 1046 into law Wednesday, expanding a pilot program across four counties that requires ignition interlocks for drunk drivers.

SB 1046 allows first-time drunk driving offenders to drive with an ignition interlock after being arrested or convicted instead of giving up all driving privileges.

Ignition interlocks are currently mandatory for all convicted drunk driving offenders in Alameda, Los Angeles, Sacramento, and Tulare counties.

Under the new law, effective January 1, 2019, ignition interlocks will be required for first offenders who cause an injury and all convicted repeat offenders.