== any proof? anything at all? == 

 so has there ever be any real proof that's even slightly convincing?                                 
 i'm thinking along the lines of f.e. showing the handicapped person a picture or some such. 
 then letting the facilitator back in the room and see if he can made the handicapped person describe the picture. done at a few different times and locations to circumvent the 'he was nervous/asleep' argument.            
 asking them to describe events from their childhood is obviously not be reliable: to much risk of vague always-right descriptions, and even more crap along the lines of 'you have sexually molested your child and now it confides in me' whenever the facilitator feels frisky and her mind starts to wander to sexy-times.