The man jailed over the bombing of the National Crime Authority office in Adelaide has lost an appeal over an unrelated conviction for spitting at a detective.
In March, Domenic Perre was found guilty in Adelaide Magistrates Court of aggravated assault over the incident at the Adelaide Remand Centre in 2018.
Two detectives had gone to speak with Perre over an alleged assault on him by another prisoner.
But when the cell door was opened and one of the officers stood in the doorway and called his name, Perre turned over on his bed, raised his head and spat on the sergeant's clothing.
He had previously indicated to prison officers he did not wish to speak with police.
In an appeal against his conviction, Perre argued that the magistrate hearing the case had not adequately explained his reasons for reaching the guilty verdict and had not properly considered the lack of forensic evidence, including DNA or photographs or video of the incident.
In a Supreme Court judgment on Thursday, Chief Justice Chris Kourakis found that the magistrate's reasons for his decision were inadequate and failed to properly explain how he was convinced of Perre's guilt.
But Justice Kourakis said he was satisfied the evidence did prove Perre spat on the detective in the course of his official duties.
He said he had read the evidence given by the two officers and found it to be coherent and consistent.
"There is no significant overstatement, prevarication, or obstructiveness in their evidence such as to detract from its apparent reliability," the chief justice said.
In June this year, Perre was found guilty of murder and attempted murder in relation to the NCA bombing.
The 1994 attack killed Detective Sergeant Geoffrey Bowen and seriously injured lawyer Peter Wallis.
Sgt Bowen died from horrific injuries, including the loss of his left arm, while Mr Wallis, who died in 2018, lost an eye and suffered severe burns.
In his verdict, Justice Kevin Nicholson said while the prosecution case was largely circumstantial he was satisfied beyond reasonable doubt that Perre had built and posted the bomb.
He also found that Perre had intended to kill Sgt Bowen or anyone else who happened to open the package or be close by when it detonated.
Perre will face sentencing submissions in relation to the bombing next month.
