La Guardia Committee Report (1944) — The Mayor's Marijuana Study Anslinger Tried to Bury

The La Guardia Committee Report — formally The Marihuana Problem in the City of New York, published in 1944 — was the first systematic American scientific study of cannabis. It was commissioned by Mayor Fiorello La Guardia, conducted by the New York Academy of Medicine, and produced findings that flatly contradicted the federal anti-marijuana campaign. It is one of the most important — and most successfully suppressed — documents in American cannabis history.

Why La Guardia Commissioned the Study

Fiorello La Guardia took office as mayor of New York City in 1934, the year after the federal Bureau of Narcotics began its national anti-marijuana campaign. La Guardia — a former US congressman and an outspoken opponent of alcohol prohibition — was skeptical of Anslinger’s claims about marijuana causing violent crime, insanity, and addiction in New York’s minority communities.

In 1938 he asked the New York Academy of Medicine to convene a committee to study the question scientifically. The Academy was a respected, century-old medical body. The committee that formed included 31 researchers — physicians, pharmacologists, psychiatrists, sociologists, and chemists — with NYPD cooperation for the sociological component.

The Sociological Study

The first phase, conducted between 1938 and 1940, was sociological. Plainclothes officers observed marijuana use in Harlem “tea pads” (informal cannabis salons), interviewed users and dealers, mapped distribution networks, and documented prices, customs, and demographics. The findings, which read like ethnography:

• Marijuana was widely used in Harlem and other neighborhoods, but use was overwhelmingly social and recreational, not associated with violent crime.
• The “tea pad” subculture was orderly, governed by social norms, and produced no observed pattern of escalation to harder drugs.
• Marijuana use did not appear to be linked to juvenile delinquency. Users were predominantly adult.
• Dealers were small-scale; there was no evidence of organized criminal control of the marijuana trade.
• Use crossed racial lines but was concentrated in Black and Latino communities — precisely the communities Anslinger’s rhetoric targeted.

The Clinical Study

The second phase, conducted at Welfare Island (now Roosevelt Island) Hospital, was clinical. Seventy-seven volunteer subjects — mostly prisoners offered the inducement of better food — were given controlled doses of cannabis under medical supervision. The committee tested cognitive function, mood, motor coordination, physiological response, and behavior. Key conclusions:

• Marijuana does not lead to addiction in the medical sense of the term.
• Marijuana is not the determining factor in the commission of major crimes.
• Marijuana use does not lead to morphine, heroin, or cocaine addiction — flatly contradicting the “gateway” argument that would later become a centerpiece of US drug policy.
• Marijuana use produced no permanent deterioration of mental or physical condition.
• Marijuana use in New York City was not the menace the public had been led to believe.

The thirteen formal conclusions, taken together, amounted to a scientific repudiation of nearly everything the Federal Bureau of Narcotics had been telling Congress, journalists, and the public for the previous decade.

Anslinger’s Counterattack

The report was published in 1944 with the imprimatur of the New York Academy of Medicine. Anslinger’s reaction was immediate and ferocious. He attacked the report in speeches, interviews, and congressional testimony for the rest of his career. His rhetorical strategies were several:

• Personal attacks — he denigrated the qualifications of the researchers, despite the Academy’s reputation.
• Methodological complaints — he insisted that prison-population subjects could not produce generalizable results, while ignoring that nearly all of the Bureau’s own evidence came from arrest reports.
• Pressure on the AMA — the American Medical Association published a 1945 editorial in JAMA criticizing the report, an editorial widely understood to have been influenced by Bureau lobbying. The AMA had previously opposed the Marihuana Tax Act; by 1945 it had reversed itself.
• Suppression of follow-up research — for decades, federal funding for cannabis research was channeled exclusively through institutions willing to start from prohibition’s premises. Independent replication of the La Guardia work was effectively impossible until the 1970s.

What the Report Got Wrong — and Right

The La Guardia Committee was not perfect. The clinical sample was small and skewed toward incarcerated subjects. The cannabis used in the experiments was not standardized in the way modern research requires. Some of the cognitive testing methods were primitive by today’s standards. Modern reviewers can identify limitations the 1944 authors could not have addressed.

But on the central questions — Is marijuana causally linked to violent crime? Is it physically addictive in the way opioids are? Does it inevitably lead to harder drug use? — the committee’s conclusions have been repeatedly confirmed by every serious scientific body that has revisited them, including the 1972 Shafer Commission, the 1982 National Academy of Sciences review, and the 2017 NASEM report on cannabis health effects.

Why It Disappeared

The La Guardia Report was suppressed not by formal censorship but by the simple expedient of bureaucratic silence. The federal narcotics establishment ignored it. Mainstream medical journals declined to engage with it. By the time Nixon signed the Controlled Substances Act in 1970 and placed cannabis in Schedule I, the La Guardia findings had been out of print, out of curriculum, and out of public memory for a generation.

The Shafer Commission, which Nixon himself appointed in 1971, reached almost identical conclusions twenty-eight years later — and met the same fate. Nixon shelved the Shafer report; the La Guardia report was the model for how to do it.

The Report Today

The full text of the La Guardia Committee Report remains available through libraries and online archives. Reading it today is striking: a 1944 document that anticipates, often in detail, the reform arguments that would not become politically respectable for another half-century. La Guardia himself, the New York Academy of Medicine, and the 31 researchers who signed it understood what they were saying. The federal government simply chose not to listen.

The report did not end prohibition — indeed, the worst escalations of cannabis criminalization came after it. But it stands as the founding document of evidence-based American cannabis policy, and as proof that what looks today like “new” reform research was largely settled science when Glenn Miller was still on the radio.