If it was my case I would retain an expert and get the device calibrated.
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It sounds like the blow and go is malfunctioning. Get an expert to look at the machine and get it calibrated.
Aaron M. Lukoff
Attorney at Law
Criminal & Civil Traffic Defense
Law Offices of Aaron M. Lukoff & Associates, PLLC
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If the positive Interlock blow is going to result in a probation violation or sanction by the court, you may want to retain an expert. There are lots of them out there who can show the vulnerability of the machine. Also, you could have your son polygraphed and submit the results to the prosecutor only if he passes.
If the positive is not resulting in any probation violation, just a headache since he can't start his car, you may want to see about having it replaced with another interlock. Your's might be faulty.
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