The way DNA records are stored on the UK's national database could change today after a judgement due in the European Court of Human Rights.
Two men from Sheffield, who were not convicted of crimes for which they were arrested, want their DNA profiles removed.
If the court agrees holding their DNA is being held unlawfully, because of the individual's right to a private life, the controversial database may have to be scaled back.
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Currently, everyone arrested in England, Wales and Northern Ireland is held on the database.