Police have set up a computer system which will allow UK forces to share intelligence on 15 million people.
The database, which brings together 150 separate computer systems, combines intelligence from the 43 police forces in England and Wales.
It also links to the eight police forces in Scotland, the British Transport Police, the Police Service of Northern Ireland, the Child Exploitation and Online Protection centre (Ceop), the Serious and Organised Crime Agency (Soca) and the military police.
Collectively the forces hold information on between 10-15m people. These include convicted criminals, suspects and victims of crimes, as well as the details of people who have been questioned by police but not charged.
The database is run by the National Policing Improvement Agency (NPIA).
Privacy campaign group Big Brother Watch said it was concerned that details of members of the public could be logged on the database.
Spokesman Daniel Hamilton said: “Nobody has a problem with a database of criminals but we should never build a database of innocent people and crime victims.
“The risk of this data falling into the hands of criminals is too horrifying to comprehend.”
Well said, Daniel.
Read more on BBC.