Because of its availability, relatively low cost, and addictive nature, drug enforcement experts view methamphetamine as the "crack" of the 1990's. States throughout the Nation have experienced problems with clandestine labs producing methamphetamine. The investigation and search of such labs pose health hazards to police. Particularly hazardous compounds are ether, lithium aluminum hydride, mercuric chloride, sodium potassium cyanide, Raney nickel, sodium, and hydriodic acid. Some suggestions for evidence collection and preservation are to photograph the lab as found before dismantling it; to inventory all seized items, listing description, approximate quantity, and location; to process all glassware, reaction vessels, and chemical containers for latent fingerprints, and then dismantle the reaction; and to seize all finished products, all in process reactions, and first and second stage precursors. Other evidence-collection measures are described, as is the content of a seminar on clandestine laboratory investigation and prosecution. 4 references.