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jamieLampson is the Pro Grading of the sports memorabilia world. It's a cheap ploy to rely on a questionable authenticator and blame him for the questionable items you continually offer. You're no better than the folks at Coach's Corner who offer questionable autographs.
If you were truly interested in "taking every measure", you'd stand by your items and offer refunds when they (so often) turn out to be fake.