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The correct alcohol concentration at which an arrested individual can potentially be released from custody is 0.04. In many jurisdictions, including Wisconsin, law enforcement may have guidelines for the release of individuals who exhibit a lower blood alcohol concentration, particularly when the level is below the legal limit for impaired driving, which is typically 0.08.

A concentration of 0.04 is significant because it signals a reduction in impairment compared to higher concentrations; individuals at this level may still be conscious and communicate effectively, which can aid in their potential release. Law enforcement considers factors such as behavior and overall sobriety in addition to the specific BAC reading when making decisions about detention and release.

Levels such as 0.02 would generally indicate a minor amount of alcohol but might still be subject to interpretation based on the individual's behavior at the time of the stop. Concentrations of 0.08 and 0.10 are above the legal threshold for operating a vehicle in many places and would likely lead to a longer detention period due to the presumption of impairment and risk.