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In page Right to a fair trial:

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Secret evidence has seen increased use in UK courts. Some argue that this undermines the British criminal justice system, as this evidence may not come under proper democratic scrutiny. Secret evidence can now be used in a wide range of cases including deportations hearings, control orders proceedings, parole board cases, asset-freezing applications, pre-charge detention hearings in terrorism cases, employment tribunals, and planning tribunals.[citation needed]