[Flotsam_Jetsome]

"His background is in handwriting and document authentication. I am hoping that he formed his opinion on that basis."

Why would he base it on anything else?

Thanks for the Pings, as always.

[Seizethecarp]

“Why would he base it on anything else?”

I don’t see Hayes surviving a Daubert challenge to his qualification an expert on Xerox JPEG compression is what I meant from what is in his CV.