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DATS - Drug & Alcohol Testing Services Limited

Alcohol Backtrack Analysis / Retrograde Extrapolation (The Bayes Method)

Categories: Press Releases, Training
Posted on: March 17, 2014 7:56 am

During a recent visit to carry out random unannounced workplace alcohol breath screening, an employee (“the donor”) provided a positive reading both on the first occasion and during the subsequent test some twenty minutes later.

The question we were asked to consider and indeed answer was if / whether one could [with any legal certainty] establish if the donor would have been over [or exceeded] the employers policy tolerance / limits on alcohol consumption in the workplace had the donor been screened several hours earlier at the point of arriving and commencing work.

Having already obtained two separate samples of the donor’s breath using Home Office approved equipment; we quickly instructed one of our retained Expert Witnesses to back calculate the results of the donor’s findings by applying the physiological properties [of the donor] against elimination rates in the human body. Using retrograde extrapolation [the Bayes Method] the Breath Alcohol Concentration [BrAC] level of the donor was calculated with a ‘high level of certainty’ to the donor’s start time, eventually proving to be a determinative factor.

Alcohol Backtrack Analysis is a proven and effective way of determining what a donor’s breath alcohol concentration would have been by projecting backwards from the initial test.

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