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NIK Identidrug Polytesting Desk Chart. ?The Identidrug Desk Chart guides a user through the various steps required when testing a suspected narcotic with the NIK Polytesting System. It begins with a general screening and uses blocks of color to indicate color changes in the test kits. The chart guides the user to the next test until a specific drug is identified. The back of the chart has general use instructions for the Polytesting System. Available in English only, the chart measures 21.6cm x 17.8cm (8½" x 7").