A contract is either express or implied. Ca. Civ. Code § 1619 Enacted 1872.
In accordance with the implied contract existing between a financial institution and its depositor, no bank, savings association, credit union, or other financial institution operating in this state which maintains and services demand deposit accounts, including NOW accounts, may release any funds from those accounts to any person or entity who is not the account holder, unless the funds are released pursuant to the depositor's authorization or in accordance with the law. This section does not apply