Posted By:
Kevin Saucier"If a card has been altered and graded, it can be impossible to detect the alteration through the holder."
That's really not too accurate. Inspecting a slabbed card takes about 10 minutes to be very thurough. That is a pixel by pixel exam, which is what you want for a high-end card. The slab just makes it more difficult and doubles the time. SGC is harder than PSA simply because the gasket is tighter.
Kevin