If you fail a breath test, the interlock will enter a temporary lockout period for the first failed BAC test. This lockout time is set by state regulation. If you fail the re-tests, your car may lock out for a longer period or need a reset and tow, depending on state law. The retest feature gives a chance for the alcohol to dissipate from the mouth if you accidentally ingested something that trigged a BAC. It’s a good idea to rinse your mouth out with water prior to taking the test and avoid any products that may contain alcohol. These can result in a positive alcohol reading, which is very frustrating. Depending on your state's laws and your service provider's policies, multiple failed breath tests may result in your service provider being notified and additional penalties, such as fines or additional restrictions on your driving privileges. Some changes to your routine may be required — for example, toothpaste, mouthwash, and hand sanitizer all contain trace amounts of alcohol that can trigger an alcohol reading. So can some medications and foods. Environmental substances such as windshield washer fluid and gasoline fumes also contain alcohol and can inadvertently trigger the device. If you receive a fail and haven’t been drinking, take a moment to rinse your mouth, check the surroundings and make sure the air inside your vehicle is circulating, then try again when prompted by the device. Note that if you have consumed alcohol, even if it was the prior evening and you are trying a morning start, your BAC may be high enough that you fail the test. Best practice is to not drink any alcoholic beverages while you are on your program.