Unintended consequences: In the US, the War on Drugs and resulting rise in workplace urine testing has given rise to a new growth industry: the trade in drug-free urine.

By chugging fruit juice, tea and coffee, Curtis says he produces enough urine to make 50 kits a day; he keeps another 500 gallons of his liquid waste stored in industrial freezers. "I don't waste a drop of my assets," he said.

"People do all kinds of things to avoid getting tested," Ferris said. Some borrow urine from friends and microwave it in a convenience store on their way to work. Others dilute their samples with water or Gatorade, or spike the sample with commercial products that claim to destroy unwanted toxins. In one case, a job applicant had another person's pee injected directly into his bladder.

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