Reported / Citable
Background
Jason Harley Moore was convicted in 2014 of assaulting his infant daughter by force likely to cause great bodily injury resulting in death and received 25 years to life. Moore said the child fell from a bed while he showered. At trial, three prosecution physicians gave categorical testimony that a short fall could not have produced her combination of skull, brain, and retinal injuries, which they attributed to inflicted abusive head trauma.
Years later, medical literature documented rare short falls producing injury patterns like those in the case. At a habeas evidentiary hearing, the prosecution experts retreated from their absolute trial statements. Although some still believed abuse was the most likely explanation, they agreed current science no longer supported saying that an accidental bed fall was impossible. Moore argued that this post-trial scientific development made the trial testimony false evidence under Penal Code section 1473.
The Court’s Holding
The Court of Appeal granted habeas relief and vacated the conviction. California’s habeas statute treats an expert opinion as false evidence when later scientific research repudiates the opinion or seriously undermines it. The court distinguished a permissible expert judgment about what is likely from the categorical proposition presented to Moore’s jury that the claimed accident could not have caused the injuries.
The false evidence was material because the prosecution’s experts supplied the direct link between the injuries and an intentional assault. The remaining evidence—including Moore’s delayed account and his effort to rearrange the bed—was incriminating but did not make abuse the only reasonable explanation. The defense expert had also been weakened at trial by counsel’s failure to provide complete scans. Without the experts’ absolute statements, jurors would have had to evaluate whether this was intentional abuse or a rare fatal accident. That uncertainty deprived the court of confidence in the verdict. Prosecutors may elect to retry Moore; the appellate court declined to order his immediate release.
Key Takeaways
- Later scientific research can render expert trial testimony “false evidence” even when the expert testified honestly based on knowledge available at the time.
- The key distinction is between an opinion about probability and an absolute claim that science no longer supports.
- Materiality is assessed against the whole trial record, including how strongly the disputed expert testimony linked the defendant to the charged act.
- Independent evidence of suspicious conduct does not necessarily cure false medical testimony when causation was the central contested issue.
- Vacating the judgment permits a retrial; it is not a finding that the petitioner is factually innocent.
Why It Matters
The opinion is important well beyond alleged abusive-head-trauma cases. California post-conviction lawyers should examine whether scientific developments have altered not merely the weight of an expert’s conclusion but the validity of categorical propositions the jury was asked to accept.
For prosecutors and defense counsel, it also counsels precision. An expert who can reliably say that one cause is more likely than another should not convert that judgment into scientific impossibility unless the literature supports the stronger claim.
The court did not decide Moore’s alternative theories based on a significant scientific dispute or newly discovered evidence of innocence because the false-evidence ground was sufficient. That procedural choice matters when briefing habeas petitions: overlapping theories may remain unresolved once one supplies complete relief. The opinion’s materiality analysis also treated the original defense presentation realistically, including the damage caused when defense counsel made the defense expert appear inconsistent before the jury.