Keela can detect washed blood.
Yes I know PF, but that doesn't change the fact that Keela did not alert to the white curtain on the first search but then did alert to it on the second one - or explain why this apparent 'fail' occurred on day one. IMO it can only be due to the amount of time spent searching. What else can it be?
IMO had more time been spent searching non-McCann related places - (or even the same amount of time that had been spent on everything that
was McCann related), then more alerts would have been made.
Remembering that Keela could detect the minutest odour from blood deposited 50 years (or more) ago. - then I find it hard to believe that not even a tiny trace of blood had ever been deposited in the 9 other cars, since they were manufactured, or in any of the other apartments over decades - during which time probably thousands of people had 'lived' in them. That's a bridge too far for me.