Okla. Stat. tit. 59, § 59-3107
Nonpayment on account - Collection practices
A. A lender shall collect past-due accounts in a professional,
fair and lawful manner, in accordance with the federal Fair Debt
Collection Practices Act.
B. A lender shall not threaten or pursue criminal action
against a debtor as a result of the debtor’s instrument being
returned unpaid or the debtor’s deferred deposit loan account not
being paid.
C. A debtor shall not be subject to any criminal penalty if an
instrument is dishonored.