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Afghanistan

Since 1963

Australia

Since 1950

Bangladesh

Since 1972

Bhutan

Since 1962

Brunei Darussalam

Since 2008

Chile

Since 2021

Fiji

Since 1972

India

Since 1950

Indonesia

Since 1953

Iran

Since 1966

Japan

Since 1954

Republic of Korea

Since 1962

Lao PDR

Since 1951

Malaysia

Since 1957

The Maldives

Since 1963

Mongolia

Since 2004

Myanmar

Since 1952

Nepal

Since 1952

New Zealand

Since 1950

Pakistan

Since 1950

Papua New Guinea

Since 1973

The Philippines

Since 1954

Saudi Arabia

Since 2012

Singapore

Since 1966

Sri Lanka

Since 1950

Thailand

Since 1954

The United States

Since 1951

Vietnam

Since 2004

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United Nations Office on Drugs and Crime (UNODC)

The International Consortium of Universities for Drug Demand Reduction (ICUDDR)

International Society of Substance Use Professionals (ISSUP)

African Union (AU)

National Rehabilitation Center, UAE (NRC)