Not that you wouldn't just believe everything Brenda says (I do), but this is from the supplementary information that accompanied the final CIP regulation:
For purposes of this rule, a bank will not be required to look through trust, escrow, or similar accounts to verify the identities of beneficiaries and instead will only be required to verify the identity of the named accountholder.
There's a footnote that, more or less, says your risk assessment of the customer could prompt you to "look through" the account and identify the beneficial owners.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.