My personal guess is that between 10-20% of PSA graded cards are altered without detection. Looks like David Thorn and Evan Mathis were able to trim uncut sheets and get them slabbed by PSA as originally cut in the 1960s/70s. Again, some of these card doctors have been slabbing a 1000+ cards a year for 10 years each. 10x10x1,000 = 100,000 cards just from these guys. And we're not even talking about all the bleaching, erasures, pressing, etc that isn't as detectable from images without before and after pictures.
Again, it's not like all these card alterers were only submitting five cards at a time. Often, the submissions are 100 cards long with only 3 being outed as trimmed. If you want to believe that the other 97% are clean until given visible evidence, you can. I don't live in Fantasyland.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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