Exactly four weeks before Britain leaves the EU’s single market following Brexit, it is still unclear how much access it will retain to the bloc’s data from security tools used in everything from combating crime to business information.

As the UK’s last European commissioner, I know how welcome it is that a deal was struck—and how much remains to be done

The UK does "not have as much influence or as much voice" within a major European law enforcement agency post-Brexit, says a police chief.