How installation and monitoring usually work
An approved provider installs and calibrates the unit and ties it to you and to a specific vehicle. From then on you give a breath sample to start the car, and most programs also prompt you for samples while you are driving, which you are expected to handle safely by pulling over when you reasonably can. The unit logs each event with a time stamp and photographs in some programs, and it uploads that log when you return for a service visit. A monitoring agency reads those logs, not your mechanic and not the court clerk. You are generally responsible for the cost of installation, service visits and removal, and for keeping every receipt you are given. Providers differ, so read what you are handed at installation rather than assuming your program works the way a friend's did.
What counts as a violation, and what only looks like one
Programs usually flag missed rolling tests, attempts to start the vehicle without a sample, tampering or disconnection, and readings above the level the device is set to accept. A reading is not the same thing as proof that you had been drinking. Mouthwash, breath spray, some medications, certain foods, and residue on your hands can all register, and a shared car means another person may have blown into your device. Routine service can produce entries that read like tampering when a shop simply disconnected the battery. The log rarely explains itself, which is why an explanation gathered close in time carries so much more weight than one assembled afterward. What a report shows and what actually happened are two separate questions, and only one of them is answered by the device itself.
Proving compliance is mostly paperwork
Keep the installation certificate, every calibration and service receipt, and each report your provider gives you, and store them somewhere other than the glove box. If an event shows up on a report, write down what you were doing that day while you still remember it clearly: what you ate or drank, who else used the car, whether the vehicle was in a shop. If you drive a vehicle you do not own, or your work requires a company vehicle, raise that early, because programs handle that question differently. When a monitor questions an entry, a calm and documented answer is usually more useful than an argument. We can help you respond and, where it matters, ask the provider for the underlying data rather than the summary page. The drivers who get through a monitoring period with the least friction are almost always the ones who kept their own records along the way.
