Buffy, watch out for state specific issues that override the federal regulations. For example, Reg CC is incomplete for banks in CA because the CA Expedited Funds Availability Act adds savings accounts to the mix (Financial Code §867).
Similarly, banks in CA are exempt from the cosigner notices in Reg AA because the CA Civil Code (§1799.90 et seq.) is more restrictive.
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Al Miller, CRCM
Opinions expressed are my own and not necessarily shared by my employer.