The Court of Appeal in Belfast has heard that no new evidence has emerged to compel further police investigation into alleged British government torture of 14 men during internment in the North in 1971.
The PSNI is appealing a previous ruling that its decision to end preliminary inquiries in the interrogation of the so called Hooded Men was seriously flawed or should be quashed.
A lawyer for PSNI Chief Constable George Hamilton claimed that a legal test, which would trigger an obligation to seek the prosecution of anyone who perpetrated crimes against the 14 men, has not been met.
The PSNI appeal against the ruling of the Belfast High Court last October is due to last several days.
It is being heard by Northern Ireland's Lord Chief Justice Sir Declan Morgan and two other appeal court judges.
Judgment in the case is expected to be reserved.
The 14 men, who were all Catholics, were detained indefinitely without trial and said they were subjected to a number of torture methods.