Another way to handle petty cash needs is to make the check payable to the individual bringing the check to the bank, and annotating the check that it's for "Petty Cash." Then you have to get an endorsement.
In some cases, the business calls in the request in advance, particularly if the petty cash request is more like a "coin order." That also addresses the question of whether the check amount might be altered.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8