(a) The governing body of a municipality or the commissioners court of a county may contract with a private attorney or public or private vendor for the collection of an amount owed to the municipality or county relating to a civil case, including an unpaid fine, fee, or court cost, if the amount is more than 60 days overdue.
(b) A municipality or county contracting with an attorney or a vendor under Subsection (a) may authorize the addition of a collection fee of 30 percent of the amount referred. The collection fee may be used only to compensate the attorney or vendor who collects the debt.
(c) This section does not apply to the collection of commercial bail bonds.