Upon affidavit by the current custodian or the department filed with the clerk of the district court, or by operation of law when public funds have been expended on behalf of a minor child, that the care and control of the child resides in a party other than the obligee under a child support order, the child support shall, by operation of law, be redirected to the person or agency who has the care and control of the child and shall be subject to assignment by the person having the care and control of the child pursuant to W.S. 20-6-106. The department, upon proof by affidavit filed with the clerk of district court or upon verified information it has received pursuant to W.S. W.S. 20-6-106 that the child support is subject to an assignment, may redirect the child support to the person or agency in whose favor the assignment is made.