An official check would normally not fit the legal description of "certified check." However, if it's a bank's official check, it most likely will fit the definition of either a cashier's check or a teller's check. That would put it squarely in the category of "next day" items -- not local items -- under Regulation CC.
Ignore the label that the bank put on the check. Instead, look at the parties to the check. If the check is signed by the bank that it's drawn on, it's a cashier's check. If the check is signed by one bank and drawn on or payable at or through another bank, it's a teller's check. As far as Regulation CC's availability rules are concerned, there's not a whit of difference between them.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8