Can expert testimony about mental state affecting confession reliability be excluded under Rule 608? State v. Prows Explained

In State v. Prows, the Utah Court of Appeals addressed the intersection of confession voluntariness and expert testimony regarding mental health conditions that may affect a defendant’s susceptibility to giving false confessions. The case provides important guidance for practitioners on both suppression motions and the admissibility of expert testimony under Rule 608.

Background and Facts

Prows was charged with aggravated sexual abuse of his eleven-year-old stepdaughter. During a police interview conducted while his attorney was present, officers used the false-friend technique, representing themselves as acting in his best interest. The interview lasted fifty-one minutes, including a thirteen-minute private consultation with his attorney. Prows ultimately confessed to inappropriate touching on three occasions but denied other accusations. Prows suffered from depression, ADD, and Dependent Personality Disorder, though he had taken his prescribed medications that morning and indicated on a police form that he felt “good” and had slept the previous night.

Key Legal Issues

The court addressed two primary issues: (1) whether Prows’s confession was involuntary under the totality of circumstances test, considering both external interrogation factors and his subjective characteristics; and (2) whether expert testimony about his mental state’s impact on confession reliability was properly excluded under Rule 608 of the Utah Rules of Evidence.

Court’s Analysis and Holding

The court affirmed the denial of the suppression motion, finding the confession voluntary. External factors supported voluntariness: the brief duration, presence of counsel, lack of threats or promises, and minimal coercive techniques beyond the false-friend approach. Regarding subjective factors, while Prows had mental health conditions, officers were unaware of most conditions and had no reason to exploit known conditions. Significantly, Prows provided confession details independently rather than parroting police suggestions.

However, the court found error in excluding expert testimony under Rule 608. Drawing on State v. Adams, the court distinguished between direct opinions on truthfulness (prohibited) and testimony about mental capacity affecting reliability (permissible). Expert testimony about how mental conditions affected Prows’s susceptibility to confession was not a direct truthfulness opinion and should have been admitted.

Practice Implications

Despite finding error in excluding the expert testimony, the court applied harmless error analysis and affirmed because other strong evidence supported the conviction, including victim testimony, corroborating witness accounts, and Prows’s tearful apology to the victim’s mother. This case demonstrates that successful suppression motions require showing exploitation of known mental health conditions, not merely their existence, and that expert testimony challenges should focus on distinguishing capacity evidence from direct truthfulness opinions.