| Belgium | | Between 2003-2005, data refer to the number of offences and each offence is represented as one separate record in the database. |
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| Since 2006 data refer to the number of offences and only the main offence: someone can have more than one drug in his/her possession; not only the main substance is mentioned. Offences without a specified substance are included.
These changes are likely to affect comparability across time. |
| Bulgaria | | Based on the number of reports where cannabis is recorded as the main or other drug. |
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| Czech Republic | | Based on the number of reports with cannabis as the main drug. Only criminal offences. |
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| Germany | | Based on the number of reports with cannabis as the main drug. |
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| For some offences a breakdown by drug is not available, and these offences are not recorded. |
| Ireland | | Based on the number of reports with cannabis as the main drug. |
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| Greece | | Based on the number of reports where cannabis is recorded as the main or other drug. |
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| Spain | | Based on the number of reports where cannabis is recorded as the main or other drug. |
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| France | | Based on the number of reports with cannabis as the main drug. |
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| Italy | | Based on the number of reports where cannabis is recorded as the main or other drug. |
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| For some offences a breakdown by drug is not available, and these offences are not recorded. |
| Cyprus | | Based on the number of reports with cannabis as the main drug. |
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| For some offences a breakdown by drug is not available, and these offences are not recorded. |
| Latvia | | Based on all drug offences. Several different drug offences may be involved in one criminal case. |
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| Lithuania | | Based on the number of reports where cannabis is recorded as the main or other drug. |
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| For some offences a breakdown by drug is not available, and these offences are not recorded. |
| Luxembourg | | Based on the number of reports where cannabis is recorded as the main or other drug. |
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| Calculated on arrests for presumed offences against the 1973 drug law. |
| Hungary | | Based on the number of reports with cannabis as the main drug. |
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| Malta | | Based on the number of reports with cannabis as the main drug. |
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| Netherlands | | Data refer to cases registered by the Public Prosecutor. |
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| Austria | | Based on the number of reports where cannabis is recorded as the main or other drug. |
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| Poland | | Based on the number of reports with cannabis as the main drug. |
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| Portugal | | For some offences a breakdown by drug is not available, and these offences are not recorded. |
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| Since July 2001 drug use and possession for use have been decriminalized and made an administrative offence. Data on such offences, although included in this table, come from a different monitoring system. 2001 data should be treated with caution since this new monitoring system was being tested for the first time. |
| Slovenia | | Based on the number of reports with cannabis as the main drug. |
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| Slovakia | | Based on the number of reports where cannabis is recorded as the main or other drug. |
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| Sweden | | Based on the number of reports where cannabis is reported, as main or other drug. |
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| Calculated on persons given a summary fine by the prosecutor or sentenced by a court. |
| United Kingdom | | Based on the number of reports where cannabis is reported, as main or other drug. |
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| Previous data has been on an offender (person basis). Since 2005 data are based on an all drug offence basis, except for Northern Ireland, which continues to be on a principal drug (i.e person) basis. |
| Croatia | | Based on the number of reports where cannabis is recorded as the main or other drug. |
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| Turkey | | Based on the number of reports with cannabis as the main drug. |
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| After 2002 data refer to all data reported by the main prosecuting authorities (police, gendarmerie, customs).
This change is likely to affect comparability across time. |
