The way to test mediums is to go to a medium, and then after the paranormal event; examine what is in the room for ways of fakery. (Two Bears)

You don't seem to know that the book from Houdini mentioned above is using exactly this method of fraud detection. And Randi BTW is never arguing that he could do something similar under different conditions (that would be unconvincing) but that he could do the same effect under the same conditions.

Have I overlooked your comment to me saying that we both agree on this point (according to your link):
No high quality studies have thus far been published on the efficacy of reiki for pain
Do you agree with the author's assessment?

Wolfgang