UK: Her Majesty’s Inspectorate of Constabulary
09 July 2013
The report found that "27% of the 8,783 stop and search records examined by HMIC did not include sufficient grounds to justify the lawful use of the power.
See the text:
Police use of stop and search powers is too often ineffective in tackling crime and procedurally incorrect, thereby threatening the legitimacy of the police (press release, link)
And see the report:
Full text of report (pdf)