[swarmee]

Of course there are ways to detect whether cards are trimmed visually, but if it's actually a court case, I wonder if the owner would allow invasive/destructive scientific testing of the card. If three edges show 100 years of exposure to air contaminants, and one only shows 10 years of exposure, that would be scientific evidence that PSA is incompetent. So on a card like a $500 EX-MT card that became a $100,000 PSA 10, it would be worth it for the owner (who already has some kind of visual evidence that the card is trimmed from before/after photos) to allow for destructive testing.