People v. Perez, 9 Cal.5th 1

Three defendants (Chavez, Perez, Sandoval) were tried for kidnappings, robberies, and murders; juries convicted and sentenced to life without parole.
The prosecution presented gang expert Jeff Moran, who testified the defendants were Sinaloa cartel members/associates and based his opinion on police interviews, investigators’ reports, defendants’ statements, and other investigative sources.
Defense counsel did not object at trial to Moran’s relaying of out-of-court, case-specific statements on hearsay or Confrontation Clause grounds.
After trial, this court decided People v. Sanchez (2016), holding that an expert may not relate case-specific out-of-court statements for their truth unless the statements independently satisfy a hearsay exception or confrontation requirements.
The Court of Appeal held the defendants forfeited their Sanchez-based confrontation/hearsay claim by failing to object at trial; defendants petitioned for review.
The California Supreme Court reversed, holding counsel’s failure to object before Sanchez was decided did not forfeit the claim because objection would have been futile under then-controlling precedent (Gardeley).

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether failing to object at trial (before Sanchez) forfeits an appellate claim that a gang expert related case-specific hearsay in violation of the Confrontation Clause	Forfeiture: prior decisions (including Williams, Dungo, Lopez) provided grounds for objection, so objection would not have been futile	No forfeiture: Gardeley was binding at trial and permitted experts to relate hearsay as basis for opinion, so an objection would have been futile	No forfeiture: counsel's failure to object pre-Sanchez did not forfeit the claim because opposing Gardeley at trial would have been futile
Whether a contemporaneous Evidence Code §352 objection would have preserved the Sanchez-type claim	§352 objection could and should have been used to exclude prejudicial expert basis testimony	§352 is distinct from the Sanchez rule and would not have preserved a claim that case-specific statements were admissible only if independently provable or within an exception	§352 objections are different; Sanchez created a new, non-futile basis to object to case-specific expert hearsay that §352 alone would not have secured under then-existing precedent

People v. Sanchez, 63 Cal.4th 665 (establishes that experts may not relate case-specific out-of-court statements for their truth without hearsay exception or confrontation compliance)
People v. Gardeley, 14 Cal.4th 605 (previously permitted expert testimony about extrajudicial sources used to form opinions)
People v. Montiel, 5 Cal.4th 877 (endorsed limiting-instruction/§352 approach to expert basis testimony)
Crawford v. Washington, 541 U.S. 36 (Crawford confrontation clause framework: testimonial statements require unavailability and prior cross-examination)
Williams v. Illinois, 567 U.S. 50 (plurality/ fractured opinion affecting analysis of experts who relate others’ work; questioned not-for-truth approach)
People v. Dungo, 55 Cal.4th 608 (applied Williams; held no Confrontation Clause violation for expert summarizing autopsy findings)
People v. Lopez, 55 Cal.4th 569 (applied Williams; held lab report testimony did not violate confrontation clause)
People v. Edwards, 57 Cal.4th 658 (discussed preservation and futility doctrines for objections to expert testimony)
People v. Black, 41 Cal.4th 799 (frame for evaluating whether a change in law excuses failure to object)