Whereas there may be no retrievable evidence for court purposes this may well assist intelligence gathering in Major Crime investigations. Forensic testing may not produce evidence but any alert may provide intelligence to support other factors in the investigation of a crime. MG
These dogs, which had already been used on multiple occasions by the Scotland Yard and by the FBI with positive results.
http://www.mccannpjfiles.co.uk/PJ/LEGAL_SUMMARY.htm
A classic example, and one that highlights the difference between
evidence and
intelligence, is the Kate Prout murder case.
The evidence against (Adrian) Prout was that Kate had not used her credit cards and her bank accounts were untouched, for the whole period she was reported missing (and she would have needed money to live).
But a cadaver dog (Eddie, as it happens) alerted in the lounge of the matrimonial home, leading detectives to hypothesise that Prout had strangled Kate
in the lounge of the matrimonial home.
An erroneous detail.
In a safe conviction.
And (the essential point) an illustration of the difference between
intelligence and
evidence.