I have only ever argued that any police investigation would keep the dog alerts in mind as possible clues because the idea that the police would ignore them because no forensics were found isn't feasible imo.
In the Gilroy case dog alerts became part of a very complex body of circumstantial evidence.
Exactly so ... evidence was led which indicated that dogs had identified three areas of interest which supported the prosecution case of murder ... along with a substantial body of evidence painstakingly collected by the police.
http://miscarriageofjustice.co/index.php?topic=7875.msg375534#msg375534Part of the CCTV evidence produced in court included evidence tracking Suzanne Pilley's journey to work on the morning of her disappearance and Gilroy's suspicious behaviour around the work's garage that day.
SnipGilroy knew there were no CCTV cameras at the place where he and Pilley worked.
However, CCTV cameras on properties outside the building show him going in and out of the basement garage.
The man who quickly became a suspect had arrived at work by bus but later made excuses to go home and collect his car.
Later he was caught by CCTV having just bought four air fresheners.
Police believe Gilroy lured Suzanne to the basement and killed her.
He then hid her body in a stairwell before later transferring it to the boot of his car.
https://www.bbc.co.uk/news/uk-scotland-edinburgh-east-fife-17727255There was NO evidence of any kind recovered against anyone in Pria da Luz.