- Drugs > Opiates use: Annual prevalence.
- Illicit drugs: Crime statistics are often better indicators of prevalence of law enforcement and willingness to report crime, than actual prevalence.
- Justice system > Punishment > Capital punishment (last execution year): Year of last use.
- Murders > WHO: Intentional homicide rate is the estimate of intentional homicides in a country as a result of domestic disputes that end in a killing, interpersonal violence, violent conflicts over land resources, inter-gang violence over turf or control, and predatory violence and killing by armed groups. The term, intentional homicide, is broad, but it does not include all intentional killing. In particular, deaths arising from armed conflict are usually considered separately. The difference is usually described by the organisation of the killing. Individuals or small groups usually commit homicide, whereas the killing in armed conflict is usually committed by more or less cohesive groups of up to several hundred members. Two main sources of data are presented: criminal justice (law enforcement) measures (this series), supplemented by data from national statistical agencies, and measures from public health sources (see other intentional homicide series). These various sources measure slightly different phenomena and are therefore unlikely to provide identical numbers."
- Violent crime > Gun crime > Guns per 100 residents: Number of privately owned small firearms per 100 residents.
- Violent crime > Murder rate: Intentional homicide, number and rate per 100,000 population.
- Violent crime > Murder rate per million people: Intentional homicide, number and rate per 100,000 population. Figures expressed per million people for the same year.
- Violent crime > Murders: Intentional homicide, number and rate per 100,000 population.
- Violent crime > Murders per million people: Intentional homicide, number and rate per 100,000 population. Figures expressed per million people for the same year.
SOURCES: Wikipedia: List of countries by prevalence of opiates use ("World Drug Report 2011" . United Nations Office on Drugs and Crime. 2011. "World Drug Report 2006" . United Nations Office on Drugs and Crime. 2006. http://www.unodc.org/documents/wdr/WDR_2009/WDR2009_eng_web.pdf); CIA World Factbooks 18 December 2003 to 28 March 2011; Wikipedia: Capital punishment in Europe (Abolition); World Health Organisation.; Wikipedia: List of United States extradition treaties; Annexe I of the Small Arms Survey 2007 ; United Nations Office on Drugs and Crime. Source tables; United Nations Office on Drugs and Crime. Source tables. Population figures from World Bank: (1) United Nations Population Division. World Population Prospects, (2) United Nations Statistical Division. Population and Vital Statistics Report (various years), (3) Census reports and other statistical publications from national statistical offices, (4) Eurostat: Demographic Statistics, (5) Secretariat of the Pacific Community: Statistics and Demography Programme, and (6) U.S. Census Bureau: International Database.