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They use to check if you were blacklisted from amex but they don't anymore.
wonder why that matters? you as the card holder is ultimately responsible for the bill not the authorized user.
There's still potential risk even if the original member is ultimately responsible.
"Complete the fields below to add an Additional Card Member to your account. All Additional Card Members must be 15 years of age or older and must never have had a defaulted account with American Express."
That is from the Additional Card Member page.