Securesearch Inc. manufactures a series of fiber-tip marking pens, each containing microtrace amounts of different explosive particles, or one of four pseudo-drug simulants, in a volatile solvent. Ideal for canine drug and explosive detection training, the metal-bodied markers operate on a one-way release valve, activated only when the user applies pressure to the tip and moves it across a surface. The smear, while invisible, can be detected by a trained dog. Deposits can be placed on porous and non-porous surfaces, including wood, plastics, metal, stone, brick, concrete, carpets, floor tiles, curtains, luggage, etc.
