I don’t mind if you disagree at all...it all makes for robust debate.
As to pooling I very much doubt Grime was alluding to pooling in one room from another, especially a room so far from the presumed source of the blood, the area behind the couch.
‘ If there isn't a scent source in here, i.e. a physical article where the scent is emitting from, any scent residue will collect in a particular place due to the air movement of the flat, the apartment and what I would say in this case is that there is enough scent in that area there for him to give me a bark indication but the source may not be in that cupboard, the source may well be in this room somewhere else but the air is actually pushing into that corner. But strong indication and I would say its positive for things that he is trained to find, which will be part of a separate debrief.’
Note...in this room ie the bedroom.
Two further points. Neither you nor I have the expertise to judge Grimes conduct of nor explanation of the dog searches. He is the expert. Further I have never heard that the scent of blood could change over time to cadaver odour. Do you have a cite ?
Cite is Grime. Eddie and Keela both alerted to the key fob. The FSS found Gerry's DNA. Gerry is not dead.
Grime's video shows him pricking his finger for a sample of blood, then hiding it. Keela finds it and alerts to it.
Beyond that, it proves little. I have no idea if Keela was trained or tested exclusively on human blood.
The following is a true story.
Our neighbour presented us with a gift two days ago. It was a dead chicken, but still warm- It's head had been removed, but otherwise it was entire, needing gutting and plucking. Personally, I don't own a knife sharp enough to butcher a chicken.
So here's a question. Would Keela have alerted to the chicken? How would you train it to ignore a dead chicken?
By the way, my cadaver dog barks at lots of things he finds interesting. And he lies with as many teeth as he has in his head.