As of 2012, all 50 states have laws permitting the imposition of ignition-interlock devices as sentencing alternatives for drunken drivers. It is estimated that the United States could be saving 800 lives per year if all convicted drinking drivers were prevented from being involved in a fatal crash. The standard device in the US consists of a mouthpiece mounted on a handheld unit and a cord that attaches to the vehicle’s ignition system and runs on the battery. The driver is required to blow into the mouthpiece to test his or her alcohol level before starting the car. Devices are required to be installed at a certified service center. Devices are shipped directly to the qualifying service center and are never handled by the customer. The largest ignition interlock device providers are SkyFineUSA, Draeger, Smart Start, Guardian, Intoxalock, and LifeSafer.