Case Study 3

Parent evades detection from urine samples
A children's guardian was suspicious when two urine samples taken from a parent over a period of 10 days were negative, as materials associated with smoking 'crack' had been found at the parent's home. Instead of a planned third urine test, a hair sample was requested and found to be positive for crack cocaine and for cocaethylene, only detected when both cocaine and alcohol are consumed together. It was later discovered that the donor had been smuggling 'clean' urine samples into the test clinic.

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