An individual shall not execute a power of attorney under this article for the purpose of subverting an investigation of the child’s welfare initiated by the Division of Family and Children Services of the department and shall not execute such power of attorney so long as the Division of Family and Children Services has an open child welfare and youth services case with regard to the child, his or her parent, or another child of the parent. Nothing in this article shall be construed to diminish or limit any rights, power, or authority of or by the Division of Family and Children Services for the protection of any child.