Good question. I ask proponents to send me authorship studies that address facilitator cueing/control & prove their claims of communication independence, but it seems to be a big secret b/c no one has sent me anything of the kind. I'd review good FC/S2C/RPM if it existed.
The other day someone said we only target incompetent FC. This was a public demo by folks from Ashland U. Experts. Bigger issue: If there’s bad FC, and FCers admit it, why is the FC in abuse cases so strongly defended and direct testing rebuffed? How is justice served by bad FC?