One important case that counsel preparing for a trial need to keep ready to hand is People v. Sanchez (2016) 63 Cal.4th 665 (Sanchez), which prohibits parties from offering otherwise hearsay evidence through their experts.
That is what the plaintiff tried to do in the catastrophic injury case of Townsend v. Olivo (D4d2 Jun. 15, 2021) no. E073183 (non-pub.). The plaintiff suffered injuries that would lead to amputation of his leg. His expert witness testified to the $1.1 million in future medical costs. But the expert admitted he had no knowledge relating to these future procedures and prosthetic devices. He had spoken with others about the costs, however, and so testified about that.
The Fourth District Court of Appeal held this was error. The expert’s testimony about future medical expenses was inadmissible hearsay. The foundational facts were outside of the expert’s personal knowledge, and no other witness supplied them, so no hearsay exception applies.