What 'P' method of substance testing allows for a physical sample to be tested for drug content, without direct biological participation of the person being tested? The test, often seeing whether a solution will change color, is controversial for its lack of reliability.

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Considering all the tissues and cells in your body, 25 million new cells are being produced each second.


1. What 'P' method of substance testing allows for a physical sample to be tested for drug content, without direct biological participation of the person being tested? The test, often seeing whether a solution will change color, is controversial for its lack of reliability.