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OK, so this is what I quoted.
This is what you replied.
But I don't see where in this statement Grimes says anything like that.
What my quote and I are talking about is the ability to distinguish where the scent is the strongest as in relative to the surrounding areas where it grows progressively weaker and scout the area to find the strongest scent or the source until the dog alerts.
What Grimes is first talking about is the ability to alert differently to weak signals and strong signals. Apparently his dogs don't know how to do that.
It seems to mean that the dogs alert the same way regardless of whether the scent in the search area is strong or weak, overall.
But he goes on to say that
Now, immediately accessible is open to interpretation but imo it very possibly means that they only give an alert when they're sure that they're found the strongest scent, within the same search area. They may not be able to alert differently in search areas with strong scents and search areas with weak scents but they would know which way their nose points and could go from the less accessible scent to the more accessible (ie. stronger). It would make no sense to alert in the far periphery of the area where the residual scents are the weakest so no one knows what the heck the object is it that is supposed to have an odor.
I don't think this quote means what you implied that it does but I'm not Mr. Grimes.
I admit that is not how I interpreted the "accessible" quote. because he has stated that his dogs react to all scent present, even tiny, washed, historic amounts, and says they do not give different alerts depending on the strength I do not see any evidence that the dogs will fail to give an alert if there is a stronger scent elsewhere. it woudl cause the dogs to ignore things that could be vital. for instance I would imagine that the scent from a large patch of dried blood on the carpet would be stronger than the scent from a twenty year old piece of jaw underneath the floorboards, but I would say it was more damning to find the jaw than the patch of blood.http://mccannpjfiles.co.uk/PJ/MARTIN_GRIMES_RIGATORY.htm