Cal. Evid. Code § 602.A“presumption” is not evidence, but an assumption of fact that the law requires to be made from another fact or group of facts found or otherwise established in an action. Cal. Evid. Code § 600(a). Rebuttable presumptions affect either the burden of producing evidence or the burden of proof. Cal. Evid. Code § 601. Arguably,Section 1002 establishes a rebuttable presumption affecting the burden of proof because it facilitates a public policy with respect to the stability of titles.