No exceptions are allowed under current state law for commercial vehicles and motorcycles to have an interlock device. All vehicles you drive must have an interlock device installed to be in compliance of your restricted license. If your employer allows it, you can have the device installed on a non-commercial company vehicle. Anyone who uses that vehicle would be required to use the ignition interlock device, and the vehicle would be required to follow all requirements as if the vehicle belonged to you.
Department of Safety and Homeland Security / Tennessee Highway Patrol / Ignition Interlock