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A drug test (also often toxicology screen or tox screen) is a technical analysis of a biological specimen, for example urine, hair, blood, breath, sweat, or oral fluid/saliva—to determine the presence or absence of specified parent drugs or their metabolites.
Most people who take a drug test take a presumptive test, cheaper and faster than other methods of testing. However, it is less accurate and can render false results. The FDA recommends for confirmatory testing to be conducted and the placing of a warning label on the presumptive drug test: "This assay provides only a preliminary result.
Drug testing of welfare recipients has been proposed but not implemented in Canada, the UK, [2] and Australia. [3] In New Zealand, recipients of some payments may be required to take a drug test if this is a requirement of a potential employer or trainer. [2]
Welfare recipient drug testing brings shocking results. Alexis Benveniste. Updated July 14, 2016 at 10:39 PM. ... "42 people have been asked to take a follow-up drug test and 19 actually took the ...
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.
The above photo shows the positive results of the number 2 Marquis reagent presumptive drug test when used with a sample of opium. It is the primary presumptive test used in Ecstasy reagent testing kits. It can also be used to test for such substances as opiates (e.g. codeine, heroin), and phenethylamines (e.g. 2C-B, mescaline).
The test is performed by placing approximately 10 to 20 milligrams of a target substance in a glass test tube, then 10 drops of the Duquenois reagent. After shaking, 10 drops of concentrated hydrochloric acid are added, and the tube is again shaken. Any color that results after the hydrochloric acid step is recorded.
Test results may be provided immediately, after a short waiting period, or later. Drug checking services use this time to discuss health risks and safe behaviour with the service users. [3] The services also provide public health information about drug use, new psychoactive substances and trends at a national level. [4]
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