Backtracking booze with Bayes--the retrospective interpretation of blood alcohol data.

1. A Bayesian method is described which allows the explicit estimation of errors produced in estimating drug concentrations at times for which samples are not available for analysis. 2. This method was applied to the problem of 'backtracking' alcohol concentrations for medico-legal purposes. 3. Computer simulation allowed the effect of continuing alcohol absorption on the position and range of estimates of alcohol concentrations to be studied.

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