Of course you are getting ripped off that's part of the punishment for being convicted of a DWI. You don't think an interlock device really keeps anyone from driving while impaired, do you? Your best bet is to take your car in and see if they will replace the unit for you.
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It is unfortunate, but the machine is just not accurate enough. It would be a good idea to keep a log of the malfunctions. I handle many interlock violations, and my clients will often swear that the log that the Company provides to the DMV does not match the problems that they had with the machine. If you are using the QT-1 you should take it in and ask for the QT-1L. If you are still on the LJ-1 you definitely should replace the device.
Do you carry water with you so that you can rinse your mouth before blowing? That more than anything will solve most of the fails. If you are able to upgrade you should do so. There is a reason that there are upgrade machines. No machine is fail proof.
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