when talking about the detection for THC, what do they mean about the cutoff concentration?

when talking about the detection for THC, what do they mean about the cutoff concentration?for example: The cutoff concentration recommended by the Substance Abuse and Mental Health Services Administration (SAMHSA/NIDA) for a positive result in an immunoassay test is 50 ng/ml. The cutoff for GC-MS is generally 15 ng/ml.

Answer by Adam S.
They are referring to the amount of THC metabolites detected in a given volume of specimen (in this case, urine).

If there are 50 nanograms of THC metabolites per milliliter of urine, the test will trip positive. If there is less than this amount, the test will return negative.

This is kind of the theory behind many attempt to elude detection. Drug users who drink a LOT of water before a test can effectively dilute their urine to the point where a positive test result is less likely. The testing people know about this tactic though, and if your specimen appears to have been diluted in this manner (they can tell by the specific gravity of the urine), it will be disqualified and you would be required to retest.

If you're trying to avoid detection, it's best to remain well hydrated, but don't chug a half gallon of water an hour before the test, they can tell if you do this and it doesn't work reliably anyway.

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