Q: How does California define “driving under the influence”?

A:

In California, “driving under the influence” (DUI) is defined as operating a vehicle while impaired by alcohol or drugs. Specifically, California Vehicle Code Section 23152 outlines that a person can be charged with a DUI if they are found to be driving under the influence of an alcoholic beverage, or if their blood alcohol concentration (BAC) is 0.08% or higher. For commercial drivers, the threshold is lower, at a BAC of 0.04%.

Moreover, the law encompasses impairment due to drugs, including prescription medications, illegal substances, or over-the-counter drugs, if these substances affect the driver’s ability to operate the vehicle safely. This means that even if a person’s BAC is below the legal limit, they can still be prosecuted if their ability to drive is significantly impaired due to alcohol or drug use.

Consequently, penalties for DUI in California can vary based on prior convictions, the level of impairment, and whether any aggravating factors are present, such as an accident or endangerment of others. These penalties can include fines, license suspensions, and potential jail time, emphasizing the seriousness with which California treats driving under the influence offenses.

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