I respectfully disagree based on my experiences with PSA and SGC. In order to maintain an accurate population report companies like PSA have to have some way of knowing which of their cards submitted for grading have been graded before by PSA. Otherwise the sheer number of cards cracked out of holders for (hopeful) upgrades would be artificially inflated. Many people, myself included, believe PSA has some invisible marking technology that only shows up under certain lighting conditions.
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