Cocaine (benzoylmethylecgonine) is a central nervous system stimulant derived from the leaves of the coca plant. Cocaine which is also known as coke, is a strong stimulant mostly used as a recreational drug. It is commonly snorted, inhaled as smoke, or as a solution injected into a vein. Drug tests looking for cocaine and other drugs are routinely used by employers who hire workers in certain job categories. Enzyme immunoassay (EIA) is a widely used screening method designed to specifically detect benzoylecgonine and to a lesser extent, cocaine and ecgonine methyl ester (secondary cocaine metabolite).