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3. All tests that screen positive must be confirmed by gas chromatography/mass <br />spectrometry (GC/MS). GC/MS confirmation is the state of -the -art drug testing <br />technology, providing a fingerprint of the detected drug. <br />4. A medical Review Officer (MRO) will review all drug test positives test results. The <br />MRO is a physician with specialty training and expertise in substance abuse and drug <br />testing. The MRO will review presumptive positive test results to insure that proper <br />procedure, protocol, and reporting is done. The MRO will contact the person with the <br />positive test result. If the individual does not return the MRO's phone calls within 48 <br />hours, the MRO will notify the Local Union and ask that the Local Union assist in <br />locating the individual and having the individual contact the MRO. The MRO will <br />interview the person with the positive test results by telephone to access whether any <br />plausible explanation exists for the drug test positive. If no verifiable explanation exists <br />for the positive drug test, the MRO will take appropriate steps to invalidate the <br />employee's drug -free status. All persons who have tested positive must have their return <br />to work cleared by the MRO. <br />5. All drug test positive samples will be retained in a locked frozen facility at the testing <br />laboratory for one year. The retained urine samples will be available should the results of <br />Page 5 of 31 <br />