Random mandatory drug testing (traditional drugs)

The percentage of random mandatory drug tests which show drugs to be present, hence a downward trend is positive. This measure excludes tests for new psychoactive substances.

The values for 2018/19 onwards are calculated using a new weighted methodology - please refer to the HMPPS Annual Digest 2018 to 2019 for more details.

The data source is for the summary is HM prison and probation service annual digest, and the data source is for the details below is prison performance ratings (annual).

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