There is substantial agreement among scientists that the variability of a person's blood-to breathalcohol ratio contributes significantly to the experimental error in results from breath-alcohol analysis. Some have argued that the need to correct for this source of error can be eliminated by reporting breath test results in units of breath-alcohol concentration rather than blood-alcohol concentration. A simple mathematical proof is presented to demonstrate that this is not the case. Moreover,

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... e scientific and legal flaws of this argument are discussed, and recommendations are offered for dealing with the problems that have developed from adoption of this view.