Superior Court of State of Arizona County of Yavapai State of Arizona v. James Arthur Ray… (2011)

Ross's violent deprogramming activities are squarely and directly relevant to his qualifications as an expert and to the bias of his testimony. In order for the jury to understand what Ross does—and whether his opinions warrant their acceptance—the jury must know what it means to be an "expert" in "cult deprogramming, controversial groups and movements." See generally Logerquist, 196 Ariz. at 488 (jury is ultimate arbiter of the weight and credibility of expert witness testimony) . This is particularly vital where the witness's "field" is not one with which most jurors are familiar.
Source: Wikisource

Superior Court of State of Arizona County of Yavapai State of Arizona v. James Arthur Ray… (2011)

Put simply, if the expert's opinion bears only on a question that is not in issue in the case, that opinion is not relevant and not admissible.
This most basic rule of admissibility bars Ross's proposed testimony. The State seeks to introduce Ross's testimony regarding the effects of "NLP" and "LGAT" solely to address the question of why participants felt they were not free to leave the sweat lodge. As the Defense has pointed out in a recent motion,4 this question presumes a counterfactual scenario. Not a single participant states that he or she was not free to leave the sweat lodge.
Source: Wikisource

Superior Court of State of Arizona County of Yavapai State of Arizona v. James Arthur Ray… (2011)

Ross has no education or training other than a high school degree, has no specialized training in counseling or mental health matters, and has never worked with the psychologists and psychiatrists that his report cites.
Third, even if Ross's proposed testimony could clear all of these hurdles, it must be excluded pursuant to Rule 403. The prejudice attendant to introducing a cult expert at trial is plain. It is yet another attempt by the State to try this case on the basis of Mr. Ray's character, rather than the merits of its evidence.
Source: Wikisource

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