Do not leave car running unattended, you must be there for a retest.
Avoid lending your car, borrowers must be trained by you on interlock.
Stop drinking. The interlock will pick up alcohol in your system from the previous day.
You must comply with retest request, even if you are about to turn off car.
In-car environment: Air fresheners can give you a bad sample. Remove all air fresheners!
Do not leave the handheld in the sun. Shove it under the seat or cover it.
Extra mouthpieces are available at the service center.
Weak batteries will cause you grief, you may need to replace your car battery.
