The Breath Alcohol Detector test is a breath alcohol test set at zero tolerance and will detect any alcohol in the body. The tube contains finely ground crystals, which change colour if any alcohol content is found, just like the original Police breathalyser. The BreathScan device is set at 0.02% blood alcohol - BAC Ideal for occasional screening/at incident testing where a 'below legal driving limit' or a 'zero tolerance' rule is enforced.