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Subtracting two blood-alcohol results and dividing by time produces a number. It does not automatically prove that the same elimination rate applied before the first draw or to every person.
Combined cannabis and alcohol evidence deserves careful analysis. A large Norwegian study found an additive relationship while also showing that most clinical field observations were poor indicators of THC influence.
Learn what nail drug testing may show, why contamination and timing matter, and which laboratory records lawyers should request before interpreting a result.