Q: What is a “rising BAC defense”?

A:

A “rising BAC defense” refers to a legal strategy used in DUI cases which argues that the defendant’s blood alcohol concentration (BAC) was still increasing at the time of driving, resulting in a BAC level that was below the legal limit when the individual was actually operating the vehicle. This defense can be effective if evidence shows that the defendant consumed alcohol shortly before driving and was still in the process of metabolizing it.

In California, for a DUI charge, the prosecution must prove that the defendant had a BAC of 0.08% or higher at the time they were driving. If the defense can establish that the BAC was below that level at the time of driving but increased to over the limit by the time of testing, it may create reasonable doubt regarding the defendant’s guilt.

To successfully employ a rising BAC defense, the defense may need to present evidence such as testimonies about drinking patterns, timing of consumption, and expert opinions on how alcohol metabolism affects BAC levels. It requires a strategic approach to highlight that the defendant was not impaired at the time of driving despite a later measurement indicating otherwise.

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