California Code
ARTICLE 1 - General Provisions
Section 703.040.

703.040. A purported contractual or other prior waiver of the exemptions provided by this chapter or by any other statute, other than a waiver by failure to claim an exemption required to be claimed or otherwise made at the time enforcement is sought, is against public policy and void.

(Added by Stats. 1982, Ch. 1364, Sec. 2. Operative July 1, 1983, by Sec. 3 of Ch. 1364.)