"This is pretty hot stuff," declared Thomas Locke, an FBI agent specializing in narcotics. "It's so hot, it's killing people." He was referring to the growing tendency of heroin addicts to use "black tar," a smelly, dark- colored, often sticky version of the drug that is cheap, at about 20 cents per mg, and extremely potent: often 60% or 70% pure heroin. Conventional heroin, on the other hand, sells on the street at about $2.32 per mg and is rarely more than 6% pure. The Federal Drug Enforcement Administration has prepared a report citing the Mexican states of Sonora, Durango, Sinaloa...
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