Here is what Grime, in PdL, was really all about.
This business of testing stuff in one place, then testing it a second time in another (clothes, tested in the villa, transported to the gym and tested a second time; the ignition key of the Scenic, tested in the scenic, transferred to a sand-box and tested a second time somewhere well away from the scenic) precisely replicates Grime's modus operandi on a different occasion, with a different dog and in another continent (Detroit, America and the Bianca Jones case).
In the Bianca Jones case, also, you had the line-up of cars, much longer than in PdL.
I am out-of-kilter with many on this (including many whose opinions I respect) but I don't believe I'm wrong.
I think the essential difference between Morse (whom Grime operated with in Detroit) and most other cadaver dogs is that Morse was desensitised to the scent of blood.
The weak link in the Eddie-and-Keela combination was that both dogs reacted to the scent of blood.
What is the point of two dogs that do the same thing?