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United Kingdom
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BAC meaning

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What does BAC mean?
In legal practice, BAC commonly means blood alcohol concentration (or content): the amount of alcohol in a person’s system used to determine drink‑driving liability and inform workplace or safety‑critical alcohol policies. The acronym itself is descriptive; UK road traffic legislation refers to the “proportion of alcohol in breath, blood or urine,” with precise limits set in statute. Key limits differ by jurisdiction. In England & Wales (and, at the time of writing, Northern Ireland) the limit for most drivers is 80 mg alcohol per 100 ml blood (35 micrograms per 100 ml breath; 107 mg per 100 ml urine) under the Road Traffic Act 1988 and associated regulations. Scotland imposes lower limits: 50 mg blood (22 micrograms breath; 67 mg urine). Ireland sets 50 mg blood for most drivers, with lower limits (typically 20 mg) for specified categories such as learner, novice and professional drivers under the Road Traffic Acts. BAC is central to evidential testing (breath, blood or urine), charging decisions and sentencing for drink‑driving offences. The abbreviation is not generally used in legal practice to mean “Barnwood Alert Centre” and that usage should be avoided.
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