BreathScan is a reliable, single-use, breath alcohol detector. It provides convenient, non-invasive alcohol screening and detection on the job, at home or anywhere you go. Easy to carry and simple to use, and alcohol specific. Squeeze tube to break ampoule and activate the crystals Blow through the tube Get your result If BreathScan® detects the presence of alcohol in an individual’s breath, the crystals will change color.