The EU and home affairspublished at 11:35 Greenwich Mean Time 2 November 2016
UK-EU security inquiry
Select Committee
Parliament
Between 1995 - 2000 EU members agreed on 130 policing and judicial measures including exchange of information and harmonising criminal procedure.
Since 2009 the UK has had an "opt out" arrangement on any new measures.
The UK has opted in to a number of measures including the European Arrest Warrant and the Schengen Information System.