With all due respect Dave I believe you are clutching at straws in your attempt to discredit the alerts. There's an old post on here from someone else trying to discredit the dogs. I forget their name now (I think it may have been "Debunked") but they use a maths formula to attempt to show the percentage of alerts that are wrong (i.e not alerts to cadaver odour or human blood). Off the top of my head they conclude that the dogs are only correct about 4 times out of 10 alerts. So you discount any 60% you like in this case.... and what does that leave us with? Alerts only at items connected with the McCann's. We know that analysis from forensic material collected at some of these sites proved to be "inconclusive" but the fact still remains that it is - even by "Debunked's" formula - the case the some of these alerts were to blood or cadaver odour.
Research in Forensic Science journals puts the accuracy of the alerts above 90% btw.
I'm certainly not clutching at straws my analysis is bang on.
It isn't just what I say it's what all the experts say.
You can't take that 90% figure and use it to assess the accuracy of the alerts.. That isn't how it works
The alerts are total trash.. Imo.. Based on all the evidence.
Even Grime admits any dog not trained solely on human dec odour is unreliable.
