You might be debating something different...I havent mentioned the alert in the wardrobe...my point is re what gunit pisted re alerts when no tangible e vidence is present...you are obviously confused
"The first alert was given with the dogs head in the air without a positive area
being identified. This is the alert given by him when there is no tangible
evidence to be located only the remaining scent."
So the first alert was near the wardrobe in the parent's bedroom. As the dog's head was in the air Grime concluded he had scented no tangible evidence (no body, blood or other forensic material). He scented cadavour oudour only.
"The second alert was one where a definitive area was evident. The CSI dog
was therefore deployed who gave specific alert indications to specific areas...
when he's gone behind the sofa what I saw was that approximately in the centre of the wall where the window is, just along the tile area between the tiles and the wall,
he's been scenting there a lot stronger than he has anywhere else and the when he's gone out there the second time he has decided yes that's what I'm looking for and that's when he has given me the bark indication."
https://www.mccannpjfiles.co.uk/PJ/MARTIN_GRIMES.htm