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I'm gonna have to call BS on that. Finding water accidentally is astronomically more likely than finding a bomb.

Unblinded tests mean that the tester knows where the bomb is. Imagine you have a bomb on a table. Someone brings a bomb detector over and when they point it at the bomb, it indicates that a bomb is detected. Point it away, and it stops. This is a very convincing demonstration if you don't suspect shenanigans.

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