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High Bac (high Blood Alcohol Concentration)

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Definition - What does High Bac (high Blood Alcohol Concentration) mean?

BAC or blood alcohol concentration is the level of alcohol in an individual's blood. Blood alcohol concentration can be affected by the individual's body weight, the rate their body absorbs alcohol, the individual's age and their metabolism. All states have passed DUI (driving under the influence) laws which make it illegal for drivers to operate a motorized vehicle with a BAC of 0.08% or higher. Most states have also passed laws which allow the state to impose more severe DUI penalties if the driver has a high BAC or blood alcohol concentration level when they are arrested for DUI.

The BAC range considered "high" may vary by state but is generally between 0.15% and 0.20%. DUI penalties may also vary by state but can include:

  • Mandatory installation of an ignition interlock device
  • Extended participation in alcohol education rehabilitation programs prior to driver's license reinstatement
  • Refusals to grant probation
  • Increase in jail or prison incarceration
  • Increase in DUI fines and court fees

Increased DUI penalties and fines may be imposed for drivers arrested with a high blood alcohol concentration even if it is the driver's first offense.

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