Accused Claremont serial killer Bradley Robert Edwards does not appear in security footage showing the final hours of two victims at nightclubs but can't be excluded as a customer at a nearby service station.
The 51-year-old former Telstra technician and confessed rapist is on trial in the Western Australia Supreme Court accused of murdering Sarah Spiers, 18, Jane Rimmer, 23, and Ciara Glennon, 27, in 1996 and 1997.
The trial was shown CCTV footage on Wednesday of Ms Rimmer and Ms Glennon on the nights they vanished from the entertainment strip.
Both are seen smiling and talking to people.
In one video, Ms Rimmer is outside the Continental Hotel leaning against a column and looking at her watch at 12.04am.
When the rotating surveillance lens returns about 35 seconds later, she is gone.
Detective Sergeant Justin Geary testified Ms Rimmer was not seen in footage later that night while Edwards did not appear in any clips at all.
Footage showing Ms Glennon going inside the Continental Hotel with a friend at 11.38pm is the only footage of her that night.
Edwards was again not captured, nor was his Telstra vehicle or his parents' cars.
But only some could be identified from those captured due to lighting, people walking past and the angle of cars turning.
Det Sgt Geary agreed under cross-examination police were unable to find footage of Ms Glennon inside the packed Continental Hotel due to the angles of the black and white cameras and her diminutive height.
The court also viewed footage from a nearby petrol station just after 7pm, showing an unidentified customer - a tall man with dark hair wearing a white shirt, dark trousers and glasses.
Defence counsel Paul Yovich argued there was no evidence the man was Edwards but prosecutor Carmel Barbagallo said he could not be excluded.
Justice Stephen Hall said it was possible it was Edwards and allowed the footage to be tendered.
Ms Rimmer's workmate Lynda Donovan testified she was happy at the start of the evening when mildly affected by alcohol but became upset later so the pair went outside for a chat.
"She was just really sad and saying that she was ugly and fat and all of those types of things, and I was just trying to comfort her and tell her it wasn't true," Ms Donovan said.
Later, as the group planned to leave, Ms Rimmer decided not to join them.
"She just said she wasn't going to go home. She wanted to stay out," Ms Donovan said.
They stopped the taxi and called out to her: "Get in the taxi. Come on, let's go."
But Ms Rimmer just "shook her head and turned away".
Her naked body was discovered almost two months later covered by branches in bushland in Perth's south.
The same day she was taken, Paul Langenbach, 43, was horse riding with a woman when his animal became spooked and threw him off.
"I actually found a watch right at my feet," he testified.
"I popped it in my pocket and took it home with me."
Mr Langenbach said he had a "lightbulb moment" after seeing media reports and returning to the area, realising he had found Ms Rimmer's scratched, silver Guess watch.
It turned out to be just metres from her body.
Ms Glennon was last seen leaving the Continental Hotel, then talking to a person in a car.
Her body was found under branches in bushland in Perth's north the following month.