So ...edited out... do you believe the dogs alerted to the scent of death irrespective of who caused it? Because to accept that premise does not automatically and exclusively implicate any guilt to the mccanns.
If the answer is "no" my follow on question is this:
If you were about to board a plane and were advised not to get on as a trained dog had alerted to a bomb being on board would you still be happy to get on that plane and dismiss the request as information based on " ridiculous and unscientific interpretations"?
I truly don't see the connection - as if a dog alerted to a bomb on a plane then either a bomb will or will not be found. It's a cut and dried scenario.
If a cadaver dog alerts - then that does not necessarily mean it is an alert to a dead body, or that a dead body has ever been in that place according to the various reasons given by Martin Grime. So this is by no means a cut and dried scenario.