In Hallmark, this court explained that an expert's testimony must satisfy three requirements for admissibility under NRS 50.275: (1) the expert must be qualified in an area of "scientific, technical or other specialized knowledge"; (2) the expert's specialized knowledge must "assist the trier of fact to understand the evidence or determine a fact in issue"; and (3) the expert's testimony must be limited to "matters within the scope of [the expert's specialized] knowledge." 124 Nev. at 498, 189 P.3d at 650.

With respect to the qualifications requirement, Dr. Behrman- Lippert testified that she had a Ph.D in psychology, held licenses to practice psychology in Nevada and California, had worked extensively in the area of child sexual and physical abuse, had testified previously as an expert on child sex abuse, and understood the concept of grooming. The record supports the qualification requirement for admitting expert testimony. See id. at 499, 189 P.3d at 650-51 (noting factors to consider in qualification requirement include formal schooling and academic degrees, licensure, employment experience, and practical experience and specialized training); see also, Perez v. State, 129 Nev. , , 313 P.3d 862, 866-67 (2013).

As to the assistance requirement, we explained in Hallmark that this prerequisite is met when the expert's testimony is (1) relevant and (2) the product of reliable methodology. 124 Nev. at 500, 189 P.3d at 651. We concluded in Perez "that expert testimony on grooming behaviors and its effect on child victims of sexual abuse may be relevant depending . continued did not object below and he failed to demonstrate plain error in this regard.

SUPREME COURT OF NEVADA (0) 194.A . on the circumstances." 129 Nev. at 313 P.3d at 868. In this case, Dr. Behrman-Lippert testified that "grooming involves a series of steps, kind of progressive behaviors that essentially convince a child or adolescent that sexual conduct with an adult is acceptable or okay." She explained that common grooming behaviors included introducing a child to pornography, "beginning with behaviors that might seem okay, like wrestling or tickling" that progress to "actual touching," providing the child with gifts and favors, and spending time with a child The victim• testified that appellant was like a "cool uncle" who played video games with him, gave him rides and gifts (money and video games). He further testified that appellant tickled and wrestled with him and that those acts escalated to sexual encounters. Appellant's sexual abuse of the victim continued for two to three years before the victim reported the abuse—and only after the victim was confronted about his involvement in a sexual incident with his cousin. The victim explained that he did not report the abuse because he was afraid that he would lose his family and cared about his„uncle's feelings, as appellant was his uncle's boyfriend. Viewing this in the context of plain error, we conclude that the grooming testimony assisted the jury by explaining how appellant's behavior affected the victim, including the victim's acquiescence in the sexual conduct and his delayed reporting of the abuse, which was relevant to the affirmative defense of consent. See id. • As to the methodology requirement, we articulated certain factors in assessing that matter in Hallmark. 124 Nev. at 500-01, 189 P.3d at 651-52. While Dr. Behrman-Lippert's testimony did not meet all of the factors, we cannot say in the context of plain error that her testimony should have been excluded on this basis. See Perez, 129 Nev. at , 313 P.3d at 869 (concluding that absence of two Hallmark factors in determining reliability of methodology did not render expert's SUPREME COURT testimony inadmissible).

OF NEVADA (0) 1947A 741W4(4, As to the limited scope requirement, Dr. Behrman-Lippert's testimony was limited to explaining grooming behaviors and their effect on a child victim. Therefore, her testimony was limited to matters within her scope of knowledge.

Considering the factors we set forth in Hallmark and the trial record, we conclude that appellant failed to demonstrate that the district • court plainly erred by admitting Dr. Behrman-Lippert's testimony. But even assuming error, appellant's rights were not substantially affected considering the victim's testimony and appellant's admissions to the police that he engaged in oral sex with the victim "no more than 30 times" and the facts and circumstances he described during the police interview were largely consistent with the victim's testimony. Appellant's contention that he suffered prejudice because the jury's attention to his consent defense was likely compromised by the grooming testimony is speculative and not borne out by the record. Accordingly, we ORDER the judgment of conviction AFFIRMED.

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SUPREME COURT OF NEVADA OD) 1947A e !Mr:I-font cc: Hon. David A. Hardy, District Judge Washoe County Public Defender Attorney General/Carson City Washoe County District Attorney Washoe District Court Clerk

SUPREME COURT OF NEVADA (0) 1947A