I have to have the breathalyzer for 3 years and have less than a year left before it comes off. I have had no problems until recently when the DMV changed the calibration on the interlock systems. Since then I have had multiple fails all while either leaving for work or leaving work to come home. The system will pass me initially, then fail me on a rolling test, then turn around and pass me again on the off-test...anytime that happens 3 times you have to pay $35 for an override code. I feel I am being ripped off because I am not drinking, have no air fresheners in the car, and don't wear perfume anymore due to the calibration levels. I don't know what could be setting it off and I am scared of having consequences for a machine messing up on me!