This concern is a good reason to have a third team or person who will actually conceal the target in the container, or otherwise insure through some randomizing process that the people placing the containers do not know until after each run of ten which time the target was present.
Because it is not out of the realm of possibility that a confederate could tip off the dowser when the target is present--by making a little scuff mark in the dirt, for example, when the actual target is in the container. That's why double-blinding is important: the target-placing team should not be aware until the run of ten attempts is over which time the real target was present.
Quality post, Spektator. Edge must not be allowed to pull off a scam. Please remember SezMe's mate's point of view.
...
5.5 What’s going on?
I will offer two distinct impressions of Mike (and Danny).
I conclude Mike really believes that he can dowse. Danny is most certainly a believer so that
ANY test that involves him must be rejected out of hand. Mike can, in a wink of an eye,
explain away any inconsistency and just plow ahead as if he is actually dowsing.
My mate, however, was absolutely furious with me regarding this whole episode. She was
convinced that Mike and Danny ran a scam on me and that I was a total fool to even let the
whole experiment proceed. She’s convinced that Mike (and Danny) are scammers of the first
order and knowingly made an absolute jerk out of me.
Who knows?
...
(Not that I insinuate you would try to deceive, edge. Seriously, I don't.)
With Mr. Randi at the helm, however, a scam seems not really likely, does it?