Template:Sources for U.S. marijuana arrest numbers

Sources for marijuana arrest numbers:
 * 1965-1981: Marijuana Research: Uniform Crime Reports - Marijuana Arrest Statistics.
 * 1982-2007: Drugs and Crime Facts: Drug law violations and enforcement. From the United States Bureau of Justice Statistics.
 * 2008: Marijuana Arrests Drop for First Time Since 2002. From the Marijuana Policy Project.
 * 2009: Incarceration Nation — Marijuana Arrests For Year 2009 Near Record High. By Paul Armentano, NORML Deputy Director.
 * 1980-2009: Marijuana | Drug War Facts. From Common Sense for Drug Policy.