The Supreme Court has reserved judgment on a claim by Mr Martin Foley, an associate of the murdered Dublin crime leader, Martin Cahill, known as the General.
Mr Foley claims he is entitled to information which would help him in his attempt to secure payment of a £120,000 judgment which he secured against a State-protected witness, Mr Charles Bowden.
Mr Foley (47) has appealed a High Court decision refusing him an order aimed at establishing what financial arrangements existed between gardaí and Bowden in connection with the Witness Protection Scheme (WPS).
Mr Foley's application came after he was awarded £120,000 damages and £32,000 costs by the High Court in proceedings he took against Mr Bowden, a self-confessed drug-dealer and weapons-supplier. The proceedings were not defended by Mr Bowden.
Mr Foley claimed that Mr Bowden had admitted during the Special Criminal Court trial of Brian Meehan, who was subsequently jailed for life for the murder of Ms Guerin, that he had provided the weapon involved in an incident in which Mr Foley was shot and injured.
The High Court judge had said that Mr Foley was aggrieved that Mr Bowden, as a result of the WPS, had been rendered unamenable to the normal process of seeking to satisfy the award of damages and costs.