"Use per product instruction. ''10% volume/volume. c10% weight/volume.

MOR, morphine; THC, tetrahydrocannabinol; BE, benzoylecgonine; PCP, phencyclidine; PCC, pyridinium chlorochromate.

amine (AMP). Commercial adulterants were added according to product instructions, and chemical and household adulterants were added according to the concentrations shown on the table. The effects of these adulterants on drugs were monitored by testing the adulterated urine samples on an on-site lateral-flow immunoassay drug-screen cassette, Monitect® PC11, from Branan Medical Corporation. Test results obtained after the urine controls were treated with adulterants for 5 min (18,19) showed that some adulterants were effective in masking the presence of some drugs, especially THC. The majority of these adulterants were oxidants. The results also confirmed that some adulterant manufacturers continue to modify their formulations to foil detection. There are also commercial adulterants that are not very effective in modifying the drug-test results. Chemicals used in some of the adulteration formulas have been reported. Available information on these formulas is also included in Table 2.

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