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Interpretation and presentation of alcohol results , Using breath alcohol results in Widmark’s equation

المؤلف:  Sue Jickells , Adam Negrusz (Editors)

المصدر:  Clarkes Analytical Forensic Toxicology

الجزء والصفحة:  317

2026-10-27

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Interpretation and presentation of alcohol results

Using breath alcohol results in Widmark’s equation

 Most forensic cases that utilise Widmark’s equation employ breath alcohol rather than blood alcohol results. Thus, when using BrAC results, they must be converted into an estimated BAC before introducing the value into the equation. This introduces another factor that has uncertainty: the BAC/BrAC conversion factor. Typically, the breath and corresponding blood alcohol values are assumed to be the same (using a conversion factor of K_BAC/BrAC= 2100).

This is reasonable in forensic cases, since substituting their BrAC typically benefits the defendant by providing an underestimate of their true BAC. These principles should be kept in mind when working with Widmark’s equation.