Parapsychologists make a poor control group of scientists because part of their job is collecting evidence that parapsychology works. In science, that step is already done. Biologists do not need to prove that life works, because life exists. Physicists do not need to prove that physics works, because physics, by definition, IS the way the universe works. Einstein did not dream up relativity and then start looking for evidence to support it. He looked at the evidence that was available, and came up with relativity as a way to explain it. Parapsychologists do it the other way around.