The LaGuardia Committee report was an official scientific report published in 1944 that questioned the prohibition of cannabis in the United States. An earlier report the Indian Hemp Drugs Commission, was conducted by the colonial authorities in British India in 1893–94. The report contradicted claims by the U.S. Treasury Department that smoking marijuana deteriorates physical and mental health, assists in criminal behavior and juvenile delinquency, is physically addictive, and is a "gateway" drug to more dangerous drugs.
The report was prepared by the New York Academy of Medicine, on behalf of a commission appointed in 1939 by New York Mayor Fiorello LaGuardia who was a strong opponent of the 1937 Marijuana Tax Act.
Harry Anslinger, head of the Federal Bureau of Narcotics, labeled the report unscientific.