This is a brand name for devices (created first by Smith and Wesson, then National Draeger) that estimate the amount of alcohol in a person’s blood by a chemical analysis of a person’s breath sample. This kind of device is called a breath analysis device (or breath analyzer), and the Breathalyzer models have been phased out by most law enforcement departments in all states because of the availability of newer devices with more sophisticated, accurate, and convenient technology. Nevertheless, many people commonly refer to breath analyzers or breath analysis devices as Breathalyzers because of the widespread use of the Breathalyzer models in earlier years. The Breathalyzer device estimates the amount of blood alcohol content on the basis of a chemical reaction with alcohol in a breath sample, which causes a color change.