Lemme put it another way for you. They will reject a card when there is EVIDENCE of alteration. That does not mean it is ACCEPTABLE to alter a card in such a way that they might miss the evidence, or be unable to detect it due to technical limitations or lack of resources.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
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