From Grime's rogatory
http://www.mccannpjfiles.co.uk/PJ/MARTIN_GRIMES_RIGATORY.htm"In order to establish the accuracy of the dogs' performance with respect to the alerts given when recognizing blood and a body, to what extent are these indications viable in this particular case''
The dogs' alerts are to be considered as an area of interest or possible testing. When specific and reliable this can only be measured for confirmation.
In this case in particular, where the dogs alerted there was confirmation by positive results from the forensic examinations. It is the investigators' responsibility to apply the results of the forensic analysis to the suspects, witnesses and crime scenes.'Based upon the dogs' behaviour, is it possible to distinguish between a strong signal and a weak signal'."
"'Can the dog mix up traces of human odours with others that are non-human''
I cannot comment on what the dogs think. However, from a forensic point of view and from confirmations of scientific testimonies, the dogs appear to be extremely exact. But, forensic confirmation is required in all cases so as to be included as proof. The CSI dog is trained using only human blood. And using a wide spectrum of donors to ensure that the dog does not individualize them.
EVRD used to be trained using swine (pigs) as their odour is the closest to that of humans. But most of the time, however, the dog was trained using the odour of a human cadaver. Operationally, the dog has ignored large amounts of animal remains/bones when locating human decomposition. "
