- Blow-inhale-blow – requires the user to blow into the car breathalyzer mouthpiece for a few seconds without removing their mouth, inhale back in and blow into the mouthpiece again. This is the most accurate test, and it’s the easiest for users too. Intoxalock devices use this method.
- Straight blow – requires extreme force behind your breath sample, and is difficult for users and less accurate than other devices.
- Blow and hum – users must blow and hum into the mouthpiece, which is hard to master and causes unnecessary lockouts for many customers.
Most ignition interlock devices are similarly shaped, but some are simpler to use. Intoxalock devices have only one button to activate, which helps reduce errors and makes random retests easier to execute, since drivers don’t have to read the device.
While a failed sample means you won’t be able to start the device, you can be assured the device will NOT be able to turn off your car once it is running. Once your vehicle has been started, no ignition interlock device is able to turn it off.