Repeat with photovoltaic cells, microphones, night-vision sensors, capacitative sensors, inductive sensors, magnetism sensors, etc.
My hypothesis is that reiki is 100% placebo effect, no difference will ever be measured between otherwise identical reiki and non-reiki movements, and the most effective investigation of reiki would be measuring the brain states of patients who think they are receiving treatments.
Activating the placebo effect is good. If we can study it enough, we might even be able to do it without any bunkum.