The rehiring of retired RUC officers to assist in unsolved murder investigations taints the entire process in illegality, the High Court has heard.
Lawyers for the mother of a former RAF man killed by a loyalist gang headed by a police agent claimed the arrangements should not be allowed.
Vivienne McCord's 22-year-old son, Raymond McCord jnr, was found beaten to death in 1997.
His killing was at the centre of a damning report by former Police Ombudsman Nuala O'Loan which established evidence that rogue Special Branch officers colluded with a north Belfast UVF unit responsible for up to 16 murders.
Mrs McCord fears bringing ex-policemen back to help with historical enquiries may thwart efforts to establish the full circumstances of her son's death.
Her legal team yesterday launched their bid to judicially review the Chief Constable's policy of contracting former officers who left with redundancy packages under the Patten reforms.
They cited a Police Ombudsman report which said that it was likely police informers were involved in her son’s murder
Mr Justice Treacy, who heard the judicial review application, reserved his judgment.