Need an ignition interlock device near Madison? Intoxalock is available at CARTRONICS MADISON, a certified Intoxalock ignition interlock installer. We can install your breathalyzer in cars, trucks, vans and other vehicles.Cartronics is an authorized dealer for some of the very best merchandise in the industry. We offer installations and warranties with all of our products. In addition, Cartronics has been an authorized ignition interlock installer for Intoxalock since 2009.