Sec. 15. EXEMPTION OF BENEFITS FROM JUDICIAL PROCESS. The fund may not, either before or after its order of disbursement by the board to a member, a spouse eligible to receive a benefit under the DROP, an eligible spouse, the guardian of an eligible child, or an eligible parent, be held, seized, subjected to, or levied on by virtue of any execution, attachment, garnishment, injunction, or other writ, order, or decree, or any process issued out of, or by, any court for the payment or satisfaction of any debt, damage, claim, demand, or judgment against a member, a spouse eligible to receive a benefit under the DROP, an eligible spouse, the guardian of an eligible child, or an eligible parent. The fund or any claim against the fund may not be directly or indirectly assigned or transferred, and any attempt to assign or transfer the fund or a claim is void. The fund shall be sacredly held, kept, and disbursed only for the purposes provided by this article.