Perhaps the situations are parallel, but I'm not sure the TPGs really signed up to prevent doctoring, but rather committed to standards and practices that were perceived to be adequate to do so. It seems to me now they have no choice but to explicitly prevent the doctoring of previously-graded cards. You are also right that I am assuming the technology is available to support a very effective system for preventing cracking, doctoring, and then regrading without public disclosure. Identifying raw cards that have been doctored may still be difficult.
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