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Supposedly, there are drinks that block detection of illicit drugs. Sellers claim that someone who has taken an illicit drug can "flush their system" by drinking the liquid, and thus provide a urine sample that doesn't show the presence of the original drug. In this sort of black market, advertising and verification are naturally lacking. A recent animal study of two agents showed that they didn't reduce signs of methamphetamine in mass spectrograms at all, but that's just the tip of the iceberg.
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