I've explained that I think he's referring to false positives Re food or roadkill.
If he did say it... He's an idiot... And I don't think he is
He then explains how false alerts are avoided;
My experience as a trainer is that false alerts are normally caused by handler
cueing. All indications by the dog are preceded by a change in bahaviour.
This increased handler confidence in the response. This procedure also stops
handlers 'cueing' and indication. The dogs are allowed to 'free search' and
investigate areas of interest. The handler does not influence their behaviour
other than to direct the search
https://www.mccannpjfiles.co.uk/PJ/MARTIN_GRIMES.htmSo false positives are when the dog reacts to foodstuffs or roadkill. False alerts are when the dog alerts without anything tangible to explain it. So if Eddie wasn't reacting to foodstuffs, and Grime was confident that he didn't cue the dog, we can conclude that he was reacting to the scent he was trained to find.