This paper describes an evaluation of a number of disposable screening devices that are used for qualitative breath testing of blood alcohol concentrations. The devices consisted of a breath collection bag or balloon, and a glass tube containing an alcohol-sensitive reagent through which the breath sample was passed. Blood alcohol concentrations were estimated from color changes in the reagent.

The results obtained with each disposable screening device were compared with actual blood alcohol concentrations. The frequencies of erroneous results obtained with each device at different ranges of actual blood alcohol concentrations are presented. All of the devices tested were found to produce a high frequency of erroneous results.