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A split specimen is a part of a drug-testing specimen (urine or saliva (oral fluid)) that is sent to a first laboratory and retained unopened and is transported to a second laboratory if the employee requests that it be tested following a positive test of the first specimen or an adulterated or substituted test result. An employee has 72 hours after notification of a positive test and/or refusal to test due to adulteration or substitution to request testing of the split specimen.