Mega Edition: The State Of Idaho Once Again Responds To The Kohberger Autism Motions (10/6/26)

The State argued that Bryan Kohberger should not have been allowed to use his autism diagnosis as a broad explanation for his behavior during the guilt phase because Idaho law sharply limited the use of mental-condition evidence. Prosecutors relied on Idaho Code § 18-207, which provides that a mental condition is not itself a defense to criminal conduct and permits expert testimony only when it bears directly on a state-of-mind element the State must prove. Kohberger’s own expert disclosures said the autism testimony was not being offered as a traditional mens rea defense, but instead to explain his demeanor, social behavior and other characteristics the defense feared jurors might interpret negatively. The State responded that this put the evidence outside the statutory exception: if Kohberger was not claiming autism prevented him from forming the required criminal intent, then the diagnosis did not tend to prove or disprove an element of the murders. Prosecutors also said they did not intend to introduce evidence characterizing Kohberger as socially odd or use his courtroom behavior as proof of guilt, weakening the defense’s argument that autism evidence was needed to rebut such impressions.

The State also argued that Kohberger’s demeanor while sitting at counsel table was not evidence in the first place, particularly if he chose not to testify, so expert testimony explaining that demeanor would invite jurors to focus on something they legally were not supposed to consider. Judge Steven Hippler largely agreed with that reasoning, finding that allowing experts to explain Kohberger’s flat affect, intense eye contact, awkward posture or limited emotional responses could confuse the issues, encourage jurors to scrutinize his behavior even more closely and potentially generate sympathy unrelated to the actual evidence. The judge noted that he had observed Kohberger through numerous lengthy hearings and had not seen the kind of extraordinary or alarming courtroom behavior that required expert explanation. The court therefore ruled that autism evidence offered merely to explain Kohberger’s courtroom demeanor was inadmissible if he did not testify, while leaving open the possibility that some neuropsychological evidence could become relevant if the State opened the door to it or if Kohberger testified and his demeanor became relevant to his credibility.


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