Answer:
Your legal counsel is the best source for an answer and signs are simply one form of deterrent. As long as a person is in a place open to the public (your bank), he/she has no reasonable expectation of privacy. This includes being watched in person or electronically. Some states may have additional requirements particularly regarding the recording of conversations, so please check with yours. As to employees, they have no reasonable expectation of privacy, either. (Except for restrooms.)
First published on BankersOnline.com 11/26/07