Forensic Investigations students take part in presumptive drug testing. The “NIK” kits produce a colorimetric reaction when a small drug sample is introduced to a chemical reagent within a plastic pouch. A positive color change indicates the presence of a particular narcotic (heroin, cocaine, marijuana, meth). This process assists law enforcement with probable cause to seize narcotics and make arrests. The narcotics once lawfully seized, should also be sent to a forensic laboratory for a confirmatory test.