Can medical marijuana curb the heroin epidemic?

In the 1930s, Harry J. Anslinger, the first head of the Federal Bureau of Narcotics, embarked on a fierce anti-marijuana campaign. Highlighted by the 1936 anti-marijuana film Reefer Madness – where marijuana is depicted as a dangerous narcotic that makes good kids become sex-crazed killers – his propaganda efforts also maliciously linked marijuana use to African Americans and ethnic minorities.