A new website has been set up to display infrared videos, presumably taken surreptitiously, that show what goes on behind the scenes at one physical/materialization medium's seances. His name is Gary Mannion. (No, I'd never heard of him, but apparently he has a following in the UK.)
It's interesting stuff, and a reminder that books like The Psychic Mafia tell an important part of the story.
More disturbing than the videos themselves is the likelihood that a not-insignificant portion of Mannion's clientele will accept whatever explanation he comes up with — probably that a malevolent spirit possessed him and made him cheat, just this one time.