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  2. Marquis reagent - Wikipedia

    en.wikipedia.org/wiki/Marquis_reagent

    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).

  3. Presumptive and confirmatory tests - Wikipedia

    en.wikipedia.org/wiki/Presumptive_and...

    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.

  4. Mandelin reagent - Wikipedia

    en.wikipedia.org/wiki/Mandelin_reagent

    The Mandelin reagent is used as a simple spot-test to presumptively identify alkaloids as well as other compounds. It is composed of a mixture of ammonium metavanadate and concentrated sulfuric acid.

  5. Duquenois–Levine reagent - Wikipedia

    en.wikipedia.org/wiki/Duquenois–Levine_reagent

    The Duquenois reagent is used in the Rapid Modified Duquenois–Levine test (also known as the simple Rapid Duquenois Test), which is an established screening test for the presence of cannabis. The test was initially developed in the 1930s by the French medical biochemist Pierre Duquénois (1904–1986) and was adopted in the 1950s by the ...

  6. New York punished 2,000 prisoners over false positive drug ...

    www.aol.com/news/york-punished-2-000-prisoners...

    The state’s contraband drug testing program requires two tests for suspected illegal substances. The first is a presumptive test, which then has to be sent to an outside lab for confirmation ...

  7. New law requiring California bars to offer drink spiking drug ...

    www.aol.com/news/law-requiring-california-bars...

    A new law requiring many California bars and nightclubs to offer common date-rape drug test kits will take effect Tuesday, according to the California Department of Alcoholic Beverage Control.