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					Originally Posted by JamesGallo  I know the card market does not like any restor work, but I doubt a professional pressing could be detected.  The comic grading company CGC can not detect when a comic is pressed so I see no reason why PSA could.
 I would suspect a chemical cleaning if it is not trimmed.  I would say crack it bring it to SGC at a show to do on site grading if they think it was altered you can at least find out what they think is wrong by asking the graders.
 
 James G
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 I think they test the thickness of the stock.  A professionally pressed card would still be thinner all around.