In California, driving under the influence (DUI) becomes a crime when you have a blood-alcohol content (BAC) of 0.08% or more for adult drivers—a standard many states use as well. Wikipedia+1 For drivers under 21, the limit is much lower (0.01%) and for commercial drivers 0.04%. Wikipedia After you’re arrested, the DMV uses an administrative process: your license can be revoked or suspended even before the criminal case is decided. Wikipedia+1
For a first-offense misdemeanor DUI in California (no one injured, no huge aggravating factors), you could face up to six months in county jail—but many first timers avoid jail if certain criteria are met. FindLaw+1 Also: ignition interlock device (IID) requirements (cars that won’t start if you’re over a limit) are not mandatory for all first-time offenders in California; they’re only required in certain counties or for aggravating factors (e.g., high BAC, repeat offense) or when a child passenger was present. CalMatters+1
Where it stacks up weaker compared to other states


