An inquest into the deaths of two IRA men killed by an undercover Army unit should examine whether a culture of collusion was in place, a lawyer said.
Daniel Doherty (23) and William Fleming (19) were killed in the grounds of Gransha Hospital in Derry in December 1984.
It was alleged the pair, both from the city, planned to attack an off-duty member of the UDR when soldiers ambushed them, firing almost 60 shots. It is understood the SAS and the Army were involved.
A lawyer for the dead men's families told a preliminary inquest hearing in Belfast more evidence should be forthcoming.
Karen Quinlivan QC said: "What this is about is establishing whether there was a culture in place which facilitated collusion."
She recalled evidence from a previous inquest into the SAS killing of IRA men. She said a member of the Ministry of Defence said the RUC was willing to "tip the wink" for soldiers going into interviews.