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Testing Truths says, "Currently, 50 nanograms of THC metabolites per millimeter of urine defines a "presumptive positive" by NIDA certified labs. These cutoffs are not mandated for all testing facilities. The lab your sample is sent to may use a cutoff level of anywhere from 50Ng/ml to 15Ng/ml for confirmation testing, The fact is, methodology, accuracy and cutoff levels vary from lab to lab. This makes it extremely difficult to take appropriate counter-measures."
Source: http://www.passitkit.com/testing1.htm

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Q: What is a failing nanogram count for weed on a urinalysis?
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