PSA's claim that they catch a certain percentage will also include the number of cards that are not actually altered or minsize that they declare. These are usually less important because if they aren't actually altered, they get slabbed the next time submitted.
Alpha errors versus beta errors. False positives vs. False negatives.
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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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