And you accuse OxfordBloo of wordy bs. 
What do you make of the 45 incorrect alerts by Zampo in the case of the swedish serial killer that never was? How do you apply what you have written above to his woeful performance?
Probably a poorly calibrated instrument

If a Swedish geezer has an instrument that is defective that is no reason for me to believe a similar instrument I am using is also defective. I would calibrate my instrument as a matter of course at regular intervals.
Ya'll seem to be getting into a muck sweat over doggies. I have already said [elsewhere on this forum] that I believe if a dog alerts there are three possibilities one of which has two separate sub divisions. The usefulness of the data being variable from "gotcha" to "about as helpful as teats on a boar". I don't happen to think dogs are a synthesis of Billy Batson and Paul Metcalfe. Nor do I subscribe to the theory they are by definition useless.