Retrograde Extrapolations

Retrograde extrap­o­la­tions are a some­what con­tro­ver­sial cal­cu­la­tion per­formed in foren­sic alco­hol cases (DUI cases). The goal is to pre­dict what someone’s alco­hol con­cen­tra­tion would be ear­lier in time, given a known con­cen­tra­tion later in time.

The rea­son it is con­tro­ver­sial is that is heav­ily relies on assump­tions, many of which are not in evi­dence. The per­son performing

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