(Please note: the names and locations of all parties have been changed to protect the confidentiality of the participants in this elder abuse/personal injury case and its proceedings.)
The legislature, in codifying the discovery rule, has also required plaintiffs to pursue their claims diligently by making accrual of a cause of action contingent on when a party discovered or should have discovered that his or her injury had a wrongful cause. (See, e.g., Code Civ. Proc, §§ 340.1, subd. (a) [ within three years of the date the plaintiff discovers or reasonably should have discovered ], 340.15, subd. (a)(2) [ [w]ithin three years from the date the plaintiff discovers or reasonably should have discovered ], 340.2, subd. (a)(2) [ [w]ithin one year after the date the plaintiff either knew, or through the exercise of reasonable diligence should have known ], 340.5 [ one year after the plaintiff discovers, or through the use of reasonable diligence should have discovered ].)
This policy of charging plaintiffs with presumptive knowledge of the wrongful cause of an injury is consistent with our general policy encouraging plaintiffs to pursue their claims diligently. (Norgart, supra, 21 Cal.4th at p. 395.)
Simply put, in order to employ the discovery rule to delay accrual of a cause of action, a potential plaintiff who suspects that an injury has been wrongfully caused must conduct a reasonable investigation of all potential causes of that injury.