Random mandatory drug testing - new psychoactive substances only

The percentage of random mandatory drug tests which show drugs to be present, hence a downward trend is positive. This measure includes tests for new psychoactive substances ("NPS"), as defined in the Psychoactive Substances Act 2016.

Note this measure replaces "random mandatory drug testing including new psychoactive substances".

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).