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Is there a certain level of controlled substance or metabolite that must be present, like with alcohol and the 0.08 standard?

April 26, 2017alcohol certain controlled level metabolite PRESENT standard substance

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Is there a certain level of controlled substance or metabolite that must be present, like with alcohol and the 0.08 standard?

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No. So long as a test can measure the controlled substance or metabolite, there is no minimum threshold.