I'm glad to see a post about this topic. First off, it's my understanding that CAC has found that 15% of the coins graded by CU are doctored.
Also I for one can vouch for Kevin Saucier as being a competent detector of alterations in slabs. As for the business side of it, I recall he said that it requires roughly 15 minutes to truly evaluate a card in a slab for every possible alteration. Whether a business can work on those types of constraints remains to be seen.
Global (Mike Baker) also tried this and it didn't seem to take off.
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