Okla. Stat. tit. 6, § 2203 – Financial Institutions Prohibited from Disclosing Financial Records Unless

A financial institution is prohibited from giving, releasing or disclosing any financial record to any government authority unless:

(a) it has written consent from the customer for the specific record requested; or
(b) it has been served with a subpoena issued pursuant to Section 4 for the specific record requested.

Laws 1979, SB 116, c. 191, § 3, emerg. eff. May 17, 1979.