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SIM test is a test performed to test for sulfur reduction, Indole production and motility. Black color formed= positive for sulfur reduction Red color after adding Kovacs reag â¦ ent= positive for Indole production Microorgaism growth all over the tube= motile.
After the immunoassay test is complete and the urine screen tests positive for the specific drug(s) being tested, these findings can then be confirmed through the use of GC/MS. In some cases, positive test results from the urine drug screens must be verified before the findings can be used for legal purposes.