The "rule of thumb" is that the ID should be of the type that you'd accept for check-cashing. If your bank won't accept the ID for check cashing, you probably shouldn't accept it for CTR purposes.
That said, if it's the only government-issue photo ID the individual has ....
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8