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I'm a bit dubious about 'hand writing experts'. Have their skills actually been properly tested in a meaningful way?

the expert in question has written books on the topic, and consulted to US government agencies like CIA. I think he has some credibility.

Credibility and veracity are not the same thing. You can be a world class authority in something that is completely bogus.

this would be a definition of a paradox, how can you be world class authority in something bogus?

There were experts on phrenology.