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Retrograde Extrapolation

Reconstructing past blood alcohol levels through scientific calculation
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Retrograde extrapolation is a forensic technique used to estimate an individual’s blood alcohol concentration (BAC) at a specific point in the past, such as the time of driving, based on a later test result. This method considers factors like absorption, metabolism, and elimination rates of alcohol in the body.

The process can be complex because alcohol levels do not decline at the same rate for every person. Variables such as weight, gender, drinking patterns, food intake, and medical conditions may all affect how alcohol is processed.
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