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2. Reagent testing - Wikipedia

   en.wikipedia.org/wiki/Reagent_testing

   Reagent testing is one of the processes used to identify substances contained within a pill, usually illicit substances. With the increased prevalence of drugs being available in their pure forms, the terms "drug checking" or "pill testing" [1] may also be used, although these terms usually refer to testing with a wider variety of techniques covered by drug checking.

3. Drug test - Wikipedia

   en.wikipedia.org/wiki/Drug_test

   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.

4. Ehrlich's reagent - Wikipedia

   en.wikipedia.org/wiki/Ehrlich's_reagent

   It gives a negative test-result for 25I-NBOMe and many other non-indole-related psychoactives. The reagent will also give a positive result for opium, because of the presence of tryptophan in natural opium. [3] Pyridoxine, present in vitamin supplements, can give positive results to the Ehrlich test, showing a pink colour change. [4]

5. 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).

6. Welfare recipient drug testing brings shocking results - AOL

   www.aol.com/news/2015-07-24-welfare-recipient...

   The Arizona Department of Economic Security told the Arizona Sonora News Service earlier this year that over the course of more than five years, "42 people have been asked to take a follow-up drug ...

7. Chen-Kao reaction - Wikipedia

   en.wikipedia.org/wiki/Chen-Kao_reaction

   The reaction is used in spot tests and is also known as Chen-Kao test (or simply as Chen, Test T in UN Precursor Test Kit). The test is often used to distinguish ephedrine, pseudoephedrine, norephedrine , cathinone and methcathinone from amphetamine and methamphetamine , which do not react with Chen’s test reagent.