Installation and repair services of devices for disabling a vehicle in response to a detection of alcohol in the blood of its purported operator, devices for disabling a vehicle in response to a measurement of alcohol in excess of a safety threshold in the blood of its purported operator, and breath alcohol testers

Breath alcohol ignition interlock devices for disabling a vehicle in response to a detection of alcohol in the blood of its purported operator, namely, electronic breath-activated ignition locks; vehicle immobilizers in the nature of electronic automotive ignition locks incorporating breath alcohol testers that engage in response to a measurement of alcohol in excess of a safety threshold in the blood of its purported operator