The Constitution of the United States (1787) :
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We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defense, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.
Single Convention on Narcotic Drugs (1961) :
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the medical use of narcotic drugs continues to be indispensable for the relief of pain and suffering; addiction to narcotic drugs constitutes a serious evil for the individual and is social and economic danger to mankind
International Convention on the Protection of the Rights of All Migrant Workers and Members of Their Families (1990) :
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all migrant workers and members of their families without distinction of any kind such as sex, race, colour, language, religion or conviction, political or other opinion, national, ethnic or social origin, nationality, age, economic position, property, marital status, birth or other status