Abstract
The Lion Intoxilyzer 6000 was designed to replace the Lion Intoximeter 3000 which often gave too large a disparity between the two readings required. Reasons for this difference are classified as either instrument-induced or subject-induced. This paper desribes a program carried out to investigate what magnitude of breath difference subjects could achieve in practise with the new device. A variety of volunteers were given alcoholic beverages and 2 breath specimens taken after 20 minutes. Some of the volunteers were also asked to vary their manner of delivery in an attempt to reduce the alcohol level. Most of the subject-induced 'cheated' specimens were rejected by the instrument.