Need an ignition interlock device near Leavenworth? Intoxalock is available at Marshalls Auto Repair LLC, a certified Intoxalock ignition interlock installer. We can install your breathalyzer in cars, trucks, vans and other vehicles.Marshall Auto Repair LLC serves Leavenworth County and surrounding areas. They have a brand new facility and can repair all minor and major auto repairs. Marshall Auto Repair LLC began installing the Intoxalock ignition interlock device in 2015.