Figure PPP-1:  Average potency of cannabis resin at retail level measured as percentage of THC content, 1999 to 2004

Notes:

Imp = imported cannabis resin.

Czech Republic: 1999, 2000, 2001, 2002 and 2003 figures reported as averages are actually middle points between the minimum and maximum potencies.

Germany: Figures reported as average are actually the median.

Netherlands: 1999 data refer to 1999/2000; 2000 data refer to 2000/2001; 2001 data refer to 2001/2002; 2002 data refer to 2002/2003; 2003 data refer to 2003/2004; 2004 data refer to 2004/2005.

Italy (1): Data are based on seizures of less than 20 grams.

Italy (2): Data are based on routine analysis of seizures, without any size threshold.

Portugal: Data are based on users' reports until 2001 and since 2002 on users/traffickers and traffickers' reports.

Slovakia: 2004 data is actually the weighted mean.

See also 'General notes for interpreting data' on the Explanatory notes and help page.

Sources:

Reitox national focal points.

Belgium: Early Warning System (Laboratory Network)

Czech Republic: Police Forces and Criminalistic Institute of Prague

France-A: Laboratoire de la Police scientifique de Lyon

France-B: Laboratoire des Douanes

Germany: Bundeskriminalamt (Federal Criminal Office)

Hungary: Criminal Professional and Research Institute

Italy: Ministry of Interior, Central Directorate for Anti-Drug Services

Latvia: Forensic Research Department of the State Police

Luxembourg: Judicial Police, Special Drug Unit

Malta: Forensic Science Laboratory

Netherlands: THC-monitor (Trimbos Institute)

Austria: Federal Ministry of Interior

Norway: National Bureau of Crime Investigation

Portugal: Criminal Police Scientific Laboratory - Toxicology

Slovakia: KEÚ PZ

Turkey: Gendarme Laboratory

UK (England and Wales): Forensic Science Service