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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.
A positive initial drug screening means that the person tested has a substance in his or her body that falls into one of the drug classes and is above the established cutoff level. If secondary testing confirms a positive result, it means that the person has indeed taken this drug.