There is a huge difference between Delta-9 THC and Carboxy THC.
Delta-9 THC is the compound responsible for impairment. This compound is highly unstable and breaks down into non-active metabolites called Carboxy THC. Unfortunately, Carboxy THC compound can lasts for months in your system and still tests positive for THC. Carboxy THC has absolutely no impairment effect whatsoever.
It's important to retest your blood sample and have it independently tested to separate those two compounds and quantify how much Delta-9 THC, if any, was found in your system at the time of the drive.
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