Drug testing and the toilet bowl blues.
Clark
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HW
Sees
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KL
D005189:False Positive Reactions; D006801:Humans; D008751:Methylene Blue / Q000494:pharmacology; D015813:Substance Abuse Detection; D019966:Substance-Related Disorders / Q000652:urine*; D014881:Water Supply
D008751:Methylene Blue