The Government plans to opt out of a series of European criminal justice measures, Home Secretary Theresa May has said.
Ministers intend keeping the UK free of more than 130 measures, having been given the option of implementing all or none under the 2007 Treaty of Lisbon.
Mrs May told MPs: "The UK cannot pick and choose the measures from which we wish to opt out.
"We can only opt out en masse and then seek to rejoin individual measures.
"The Government's current thinking is that we will opt out of all pre-Lisbon police and criminal justice matters, and then negotiate with the Commission and other member states to opt back into those individual measures that it is in our national interest to rejoin."