Presumptive test designed to indicate the presence of d-lysergic acid diethylamide (LSD). Introduce LSD powder directly into the test but moisten an absorbent material with liquid LSD, air dry for 45 seconds, then place in the pouch for testing. Like all our NARK II narcotic field tests, the Ehrlichs Modified Reagent is meant for presumptive field drug testing. 10 tests/box.