WAKEFIELD, Mass., Dec. 18 -- Implant Sciences Corp. demonstrated a prototype laser-based explosives and narcotics detection device at its shareholders meeting. The system can detect vapors from certain narcotics and at least five types of explosives at airborne concentrations measured in parts per trillion. Leonid Krasnobaev, who was primarily responsible for the development of the system, demonstrated its ability to collect and analyze vapors from miniscule samples of explosives and narcotics, without contacting the target materials. 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