I have found it common practice to use branch officers to asssist the internal audit department in conducting surprise cash counts. Particularily if you're doing a complete count of a large branch, you only have a short period of time to get the count completed and you generally can't accomplish the count with only one or two (or three) auditors. Some guidelines you might consider would be to have audit staff handle the vault and assign out the teller drawers to the available officer. Officers from the teller area / chain of command shouldn't be used.
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My opinions are just that...my opinions.