It’s a failure for Grime and the dogs because despite being admissable and supposedly reliable the jury rejected their evidence. He clearly failed to convince them that when a dog alerts in the house of the accused it means they murdered someone there.
Afaik Grime has never claimed that dog alerts mean a murder was committed. All he claims is that his cadaver dogs are trained to alert to cadaver odour.
My professional opinion as regards to the EVRD's alert indications is that it is
suggestive that this is 'cadaver scent' contaminant. This does not however
suggest a motive or suspect as cross contamination could be as a result of a
number of given scenarios and in any event no evidential or intelligence
reliability can be made from these alerts unless they can be confirmed with
corroborating evidence.
https://www.mccannpjfiles.co.uk/PJ/MARTIN_GRIMES.htmThe prosecutor failed to gather enough corroberating evidence to convince the jury that a murder took place.
Once again, the evidence of the dog handler was deemed admissible as evidence, which was another confirmation that this evidence is seen as worthy of being heard.