There is nothing in Reg CC that would prohibit you from placing case-by-case holds on all credit card checks. A couple of caveats, though. First, as GuitarDude says, they are generally ineffective because the hold expires long before you learn that the check is not good. Second, if that is your policy, you need to make sure it is reflected in your written Funds Availability Policy.
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Jim Bedsole, CRCM, CBA, CFSA, CAFP
My posts - my opinions