rl- as I understand it (and we no longer do deposit secured consumer loans, so my memory may not be as clear as it should be), you can take posession of an "instrument" to perfect your lien. Unfortunately, most of us stopped issuing CDs as instruments and went to "non-negotiable" receipts. The receipts may not be instruments.
That being said, the UCC is not absolutely uniform. It is a State law issue.
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Al Miller, CRCM
Opinions expressed are my own and not necessarily shared by my employer.