A WA police officer says the decision to have matching ties made for officers who investigated Corryn Rayney's death was "a bit of tribalism".
Offering a slice of insight into life as one of WA's major crime squad detectives, Detective Sergeant Ian Moore told the court today it was no coincidence that officers arrived at the first day of Lloyd Rayney's murder trial earlier this month in matching ties.
Rather, he said, the ties had been made up and issued to officers attached to Operation Dargan, which was the code name for the investigation into Mrs Rayney's death.
"It's a little bit of tribalism," Det Sgt Moore said. "The police departments on some squads produce… a tie."
The tie, which was worn by Det Sgt Moore as he gave evidence, was thick and striped in several shades of blue.
Det Sgt Moore is the most high profile police officer to be called so far in Mr Rayney's trial. For most of the investigation into Mrs Rayney's death he was the forensic liason officer for the case.
Other detectives who were part of Operation Dargan are expected to be called in coming days.
The trial continues.