The department, by competitive bid, may select one or more collection agencies to collect or assist in the collection of an obligation due to the state or a political subdivision of the state pursuant to a tax or law administered by the department, provided that the obligation is at least one hundred twenty days past due. Notwithstanding any contract for collection of an obligation entered into pursuant to this section, the department retains authority to settle an obligation or to accept payments on an obligation.
NMS § 9-11-15