Police are searching a property near Badgingarra in relation to the disappearance of schoolgirl Hayley Dodd 14 years ago.
The 17-year-old was last seen hitchhiking on the North West Road near Badgingarra, about 205km north of Perth, on July 29, 1999.
Hayley's mother Margaret has been tireless in her efforts to find out what happened to her daughter, pushing for an inquest that was granted earlier this year.
The push for an inquest has gathered momentum in recent years after the case was investigated by the special crime squad, which handles cold-case homicides and long-term missing person files.
Detectives have narrowed Hayley's time of disappearance down to a 20-minute window on July 29.
Mrs Dodd said her daughter was last seen standing on North West Road about 11.35am by a travelling salesman and she was gone when a motorcyclist passed the area about 11.55am.
No one has been charged with her disappearance, although the movements of Bradley John Murdoch - the infamous killer of Peter Falconio - were examined in relation to her disappearance.
The family has enlisted psychics, a private investigator, an Aboriginal tracker and a British geographical profiler in the past decade to try to crack the case.