That sounds like confirmation bias. A claim that a follower of any religion can make. It demonstrates that the testing was not proper. A proper test would ask "What would I expect to see if my beliefs were false?" . If you can think of a reasonable unbiased test that asks that question then you might have something.
A proper test is whatever God put in place to test something. As for the folks doing other experiments, well, I am in no position to claim that none of them gets some sort of result from evil spirits either.
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