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Asked by Sky News whether there should be any restrictions on the number of people included in the database, Mr Blair - who has previously provided a sample of his own DNA voluntarily - said: "The number on the database should be the maximum number you can get."

The national DNA database has expanded by around a third to 3.6 million profiles since the Criminal Justice Act 2003, which allowed police to take and keep DNA samples from all people arrested for any imprisonable offence - regardless of whether they are eventually convicted.