Aims Although illicit drug purity is a widely discussed health risk, research explaining its geographic variation within a country is rare. This study examines whether proximity to the US[ndash]Mexico border, the United States’ primary drug import portal, is associated with geographic variation in US methamphetamine, heroin and cocaine purity.Design Distances (proximity) between the US[ndash]Mexico border and locations of methamphetamine, cocaine and heroin seizures/acquisitions (n = 239 070) recorded in STRIDE (System to Retrieve Information from Drug Evidence) were calculated for the period of 1990[ndash]2004
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Proximity to the US–Mexico border: a key to explaining geographic variation in US methamphetamine, cocaine and heroin purity
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