I do not think it is great for the prosecution that Grimes testifies. Grimes was the dog handler involved in the jersey care home fiasco. basicly he got paid a huge amount of money partly for the use of his dogs which he said never gave false alerts and partly for being some sort of crime scene advisor for which he had no qualifications. His dogs alerted and there was a huge fuss made, the place was dog up, matrial was found that the dog alerted to, and the media was full of stories about how his dog had uncovered child murders in a childrens home etc. However, it turne dout that there were no bodies, there had been no murders, and that the piece of material his dog alerted to was coconut. It turns out that Grimes' dogs alert to bodily fluids as well as cadaver, so the fact they alert did not mean a body had to be there, he could have just been alerting to tissues containing bodily fluids that were present. It is one thing to say a dog has never given a false positive, but it is misleading if it is not made clear to people that the dog is trained to alert to bodily fluids so an alert is considered positive even if the dog is alerting to a bodily fluid and not a body. If the defence hear about the jersey fiasco they will have a field day.