California Code, Commercial Code - COM § 4102

(a) To the extent that items within this division are also within Divisions 3 (commencing with Section 3101) and 8 (commencing with Section 8101), they are subject to those divisions.If there is conflict, this division governs Division 3 (commencing with Section 3101), but Division 8 (commencing with Section 8101) governs this division.

(b) The liability of a bank for action or nonaction with respect to an item handled by it for purposes of presentment, payment, or collection is governed by the law of the place where the bank is located. In the case of action or nonaction by or at a branch or separate office of a bank, its liability is governed by the law of the place where the branch or separate office is located.