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Most cannabis drug tests yield a positive result when the concentration of THC-COOH in urine exceeds 50 ng/mL. [10] Urine testing is an immunoassay based test on the principle of competitive binding. Drugs which may be present in the urine specimen compete against their respective drug conjugate for binding sites on their specific antibody.
As an example the SAMHSA cutoffs for cannabinoids are 50 ng/ml for the immunoassay and 15 ng/ml as confirmed by GC/MS. [6] Immunoassays that do not conform with SAMHSA, featuring a cutoff of 20 ng/ml, have been shown to produce false positives from passive inhalation of marijuana smoke. [7]
If the person is the under the influence of alcohol, a drug of abuse, or a combination of them, then it is unlawful to drive with a concentration of cannabis metabolite of at least 15 ng/ml in their urine, or 5 ng/ml in their blood or blood serum or plasma.
Urine (ng/ml) Blood (ng/ml) Prohibited substance (a) Amphetamine 500 100 (b) Cocaine 150 50 (c) Cocaine metabolite 150 50 (d) Heroin 2,000 50 (e) Heroin metabolite: (1) Morphine 2,000 50 (2) 6-monoacetyl morphine 10 10 (f) Lysergic acid diethylamide 25 10 (g) Marijuana 10 2 (h) Marijuana metabolite 15 5 (i) Methamphetamine 500 100 (j ...
A drug test showed that he had 17.8 ng/mL of THC metabolite in his system, slightly higher than the 15 ng/mL threshold used by the International Ski Federation. [169] The IOC executive board voted 3–2 to disqualify him from competition on February 11, 1998, which the Canadian Olympic Association immediately appealed. [170]
Drug Initial Test Level (ng/mL) Confirmation Test Level (ng/mL) Cocaine Metabolites 300 ... First offense: 15- to 30-day suspension and/or a fine of up to $10,000;
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