In Texas we use the Business and Commerce Code, our version of the UCC. They are very similar.
Look to 4.406
(c) If a bank sends or makes available a statement of account or items pursuant to Subsection (a), the customer must exercise reasonable promptness in examining the statement or the items to determine whether any payment was not authorized because of an alteration of an item or because a purported signature by or on behalf of the customer was not authorized. If, based on the statement or items provided, the customer should reasonably have discovered the unauthorized payment, the customer must promptly notify the bank of the relevant facts.
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Andy Zavoina
Opinions stated are not necessarily that of my employer.