Research & source archive

Cannabis studies, reports & testimonies

Official reports, government inquiries, scientific papers and historical source material collected by CCGUIDE. The original archive has been cleaned so dead or misleading links are no longer presented as clickable resources.

Verified sources

Key studies and official reports

These links have been replaced or retained because they still lead to the named report, paper or official source.

Original collection

Reports and references in the CCGUIDE archive

The original studies page mixed live sources with many links that no longer work. Historical titles are retained here, but broken targets are plain text rather than dead links.

  • Cannabis and mental health — Royal College of Psychiatrists; original leaflet dated 2011.
  • European Parliament recommendation on harmonisation of Member States' laws on drugs — Committee on Civil Liberties and Internal Affairs, 1997.
  • Seizures of drugs in England and Wales, 2010/11 — Home Office.
  • Damage and Humanity in Custody — original bookseller link removed.
  • Global Commission on Drug Policy: The War on Drugs — 2011.
  • Home Office Cannabis Potency Study 2008.
  • Report on Cannabis and the Independent Inquiry into the Misuse of Drugs — legacy target removed.
  • Cannabis and cannabis-based medicines: potential benefits and risks to health — Royal College of Physicians working-party article.
  • Cannabis for spasticity and multiple sclerosis — obsolete Oxford target removed.
  • New Zealand Health Committee of Parliament report — August 2003; obsolete target removed.
  • A growing market: The Domestic Cultivation of Cannabis — Joseph Rowntree Foundation, April 2003; legacy direct-PDF target removed.
  • Cannabis and the brain — Iversen L., Brain, 2003; 126:1252–1270.
  • Study Says Marijuana Does Not Lead to Hard Drugs — Reuters, 2 December 2002; MAPINC link removed.
  • State Pot Laws Don't Increase Use — Sacramento Bee, 30 November 2002; MAPINC link removed.
  • Canadian Senate report: Cannabis — Our Position for a Canadian Public Policy — 2002.
  • Canada: Commons Committee Report on Cannabis — 2002; MAPINC link removed.
  • Canada: Pot Blocks Painful Memories, Study Says — Globe and Mail, 1 August 2002; MAPINC link removed.
  • UK Home Affairs Committee reports — includes the 2002 drugs-policy inquiry cited in the original archive.
  • Government medical experts recommend reclassification of cannabis — Advisory Council on the Misuse of Drugs, 14 March 2002.
  • Does Marijuana Use Cause Long-Term Cognitive Deficits? — JAMA letters, 22 May 2002; MAPINC target removed.
  • National Drugs Users Development Agency Conference, London — 1 March 2002; Legalise Cannabis Alliance link removed.
  • Cannabis: A New Agenda Conference, Liverpool — 19 February 2002; Legalise Cannabis Alliance link removed.
  • Study Finds No Cannabis Link to Hard Drugs — Sunday Times, 16 December 2001; MAPINC target removed.
  • Pot Smokers Just As Healthy — Study — National Post, 11 June 2001; MAPINC target removed.
  • Studies Attempt to Get Past Medical Marijuana Myths — Daily News of Los Angeles, 19 November 2000; MAPINC target removed.
  • Cannabis Use and Cognitive Decline in Persons under 65 Years of Age — American Journal of Epidemiology, 1 May 1999; MAPINC target removed.
  • Runciman R., Drugs and the Law: Report of the Independent Inquiry into the Misuse of Drugs Act 1971 — 1999; legacy Drug Library target removed.
  • NTP Technical Report on Toxicology and Carcinogenesis Studies of Δ9-THC — 1999; legacy link removed.
  • Institute of Medicine's Medicinal Marijuana Hearing in New Orleans — January 1998, CCGUIDE archive.
  • Alternative Systems of Cannabis Control in New Zealand — 1997; obsolete UKCIA target removed.
  • Australian Drug Advisory Council Report — 1996; obsolete UKCIA target removed.
  • History of the Non-Medical Use of Drugs in the United States — Charles Whitebread, 1995.
  • WHO Project on Health Implications of Cannabis Use — Hall, Room & Bondy, 28 August 1995; old Drug Library target removed.
  • Australian Taskforce for Legislative Options for Cannabis — 1994; old target removed.
  • Psychoactive Substances and Violence — Jeffrey A. Roth, US Department of Justice, 1994; old target removed.
  • Hall W., Solowij N., Lemon J., The Health and Psychological Effects of Cannabis Use — National Drug Strategy Monograph 25, 1994; old target removed.
  • California Research Advisory Panel — 1992; original same-page reference retained below.
  • Homicide Rates, 1900–1990 — historical graph.
  • Report of Research Advisory Panel of State of California — 1989; legacy target removed.
  • DEA Docket No. 86-22: Judge Francis Young ruling — 1988.
  • Cannabis Control Policy: A Discussion Paper — Canadian Health Protection Branch, January 1979.
  • Shafer Commission / Marihuana: A Signal of Misunderstanding — US National Commission, 1972.
  • LeDain Commission: Inquiry into the Non-Medical Use of Drugs — Canada, 1970; legacy target removed.
  • The Forbidden Fruit and the Tree of Knowledge — Bonnie & Whitebread, Virginia Law Review, 1970; legacy target removed.
  • Baroness Wootton Report — UK government advisory report, 1968–69.
  • History of Alcohol Prohibition, from Marihuana: A Signal of Misunderstanding — legacy target removed.
  • LaGuardia Report: The Marihuana Problem in the City of New York — 1944; legacy direct target removed.
  • Reefer Madness — film, 1930s; obsolete CRRH target removed.
  • Testimony of Dr William Woodward — Marihuana Tax Act hearings, 1937; legacy target removed.
  • Testimony of Harry Anslinger / Marihuana Tax Act hearings — 1937.
  • Marijuana Smoking in Panama The Military Surgeon, 1933; see Panama collection below.
  • Panama Canal Zone Military Investigations — 1916–29.
  • US Senate National Prohibition Law testimony: William Cabell Bruce, William S. Vare and Judge Alfred J. Talley — 1926; old individual links removed.
  • Indian Hemp Drugs Commission — Government of India, 1893–94.
A title without a hyperlink is intentional: the old target was unavailable, timed out repeatedly, returned an error, or no longer led to the named document. This avoids replacing one broken-link problem with another.

Archive summaries

Brief outlines of selected studies

The legacy page included extended summaries and quotations. These have been condensed and rewritten for easier reading while preserving the historical context.

Netherlands · 1990s

Drug policy in the Netherlands

The Dutch policy material cited by the original page described a strategy that distinguished between cannabis and drugs considered to carry greater health risks. It emphasised limiting health and social harms, separating drug markets and judging policy partly by patterns of serious drug use.

CCGUIDE's original excerpt highlighted claims that decriminalisation of possession had not by itself produced unusually high cannabis use and that the number of young heroin users remained comparatively low.

Australia · 1994

National Task Force on Cannabis

The Australian National Task Force examined health effects, patterns of use, public opinion and legislative options. The legislative review considered five broad approaches: total prohibition, prohibition with civil penalties, decriminalisation of possession, regulated legal availability and unrestricted availability.

The archive summary records that the task force rejected both total prohibition and unrestricted availability as preferred models and regarded cannabis-law reform as a legitimate policy question.

United States · 1988

Judge Francis Young: marijuana rescheduling

DEA Administrative Law Judge Francis L. Young considered evidence about accepted medical use and safety under medical supervision in Docket No. 86-22. His recommended ruling concluded that marijuana had medical utility and could be used safely under medical supervision.

Read the archived ruling →

United States · 1982

National Academy of Sciences policy analysis

The National Research Council's Committee on Substance Abuse and Habitual Behavior reviewed cannabis policy and discussed a system in which states could experiment with different forms of control, rather than relying exclusively on federal criminal penalties.

The CCGUIDE archive characterised the report as placing significant weight on education, informal social controls and the possibility of regulated approaches.

United States · 1972–73

Shafer Commission

The National Commission on Marihuana and Drug Abuse, chaired by former Pennsylvania governor Raymond P. Shafer, reviewed cannabis policy during the Nixon administration. It recommended that possession for personal use should not be a criminal offence and also proposed removing criminal penalties for casual, non-commercial transfers of small amounts.

Read Marihuana: A Signal of Misunderstanding

Canada · 1969–73

LeDain Commission

Canada's Commission of Inquiry into the Non-Medical Use of Drugs examined drug use, law and public policy. The cannabis material was notable for treating users as citizens whose views and experiences should form part of policy development, and for considering alternatives to criminal punishment for possession.

United Kingdom · 1968–69

Wootton Report

The Hallucinogens Sub-Committee of the Advisory Committee on Drug Dependence, chaired by Baroness Wootton, reviewed the pharmacological, clinical, social and legal evidence on cannabis. It concluded that the penalties then attached to cannabis possession and supply were too severe and recommended that possession of a small amount should not normally lead to imprisonment.

Read the UKCIA archive copy →

New York · 1944

LaGuardia Committee Report

New York Mayor Fiorello LaGuardia commissioned medical, social and psychological research into marijuana use. The resulting report challenged several widely publicised claims of the period, including assertions that cannabis use inevitably caused addiction, progression to other drugs or criminal behaviour.

US military · 1916–29

Panama Canal Zone investigations

Military and civilian investigators examined marijuana use among US personnel in the Canal Zone. The historical archive records that investigators did not recommend prohibition of sale or use on the evidence they had gathered at the time.

Open the surviving archive →

India · 1893–94

Indian Hemp Drugs Commission

The Government of India convened a seven-member commission after questions in the House of Commons about hemp-drug use. It took evidence from more than a thousand witnesses across India and produced a multi-volume report examining medical, social, religious, legal and administrative questions.

The commission generally favoured regulation and taxation over prohibition and distinguished moderate use from excessive use.

Read the surviving UKCIA archive material →

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