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By having random drug tests with no advanced notice.

Be on alert for; Their having diluted urine or having put bleach in their urine. Measure urine temperature to see it is body temp. this prevents someone bringing in another persons specimen.

It is somewhat a hoax that someone can "beat" a drug test, new "drug cleansers" come around every few months, likely because the last stuff was proven ineffective.

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13y ago

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