Most of these studies are from the US, where the situation is very different to the UK. Police dogs in the UK are trained to national standards and are regularly independantly tested and licenced. No such system exists in the US, which is exactly why the FBI (a national organisation) decided to set up their own dog section, properly trained, handled and accredited.
The testing for the dogs in the UK is not very thorough and is in no way scientific.
We don't know what part grime played in the US programme as there is no independent information.
Claims that he impressed the FBI are also questionable. It seems to me he did impress one man.. Stockhouse. Was that with his skill as a dog trainer or his willingness to present them as evidence... A relatively new idea in 2007
I
Its now 17 years since Harrison and Grime got together to explore whether alerts on their own can provide intelligence... Grime considers them to be evidence.
They seem to have made little or no progress