Presumptive test designed to differentiate between Heroin and Morphine. This test is not designed as a Primary Test and ODV discourages its use. ODV 7603 NarcoTest Nitric Acid Reagent (Confirming Test) odv-7603Regular price: $19.99Sale price: $12.95 Copyright 2012 Police Supply Online providing Police Equipment to over 300 Police, Federal & Military Law Enforcement Agencies around the world.