I'm curious about the results of a drug screenign test

Patient : I use medicinal cannabis. My employer tests me regularly. The cannabinoid levels in my urine have always come back at between 46 and 50 ng/ml. My most recent test, a week ag, the results came back at 802 ng/ml. I have not increased my dosage or frequency of use and this level seems extrememly high. Is it possible for the level to rise so much without increased usage or is it more likely the result is in error?
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