State of Iowa v. Patrick J. Barrett Jr, 952 N.W.2d 308

Patrick Barrett was charged with second-degree sexual abuse of a child and requested the child-victim’s mental-health and counseling records under Iowa Code §622.10(4).
The district court conducted the required in camera review and denied disclosure, finding no exculpatory material; Barrett was tried and convicted by a jury.
On direct appeal the court of appeals reviewed the records, found they did contain exculpatory information, and remanded for disclosure and a district-court determination whether a new trial was required.
On remand the district court gave parties access to the records but evaluated the new-trial motion under the heavier weight-of-the-evidence standard (asking whether the verdict was contrary to the collective evidence) and denied relief as harmless.
The Iowa Supreme Court considered the proper legal standard for deciding a new-trial motion when exculpatory medical records were improperly withheld under §622.10(4).
The Court held the district court applied an incorrect (too stringent) standard and directed that the Brady materiality test (reasonable probability the outcome would differ) govern the new-trial inquiry; the case was reversed and remanded for application of that standard.

Issue	Plaintiff's Argument	Defendant's Argument	Held
What standard should govern a new-trial decision when a court erroneously withholds exculpatory medical records under Iowa Code §622.10(4)?	The State argued the nondisclosure was harmless and the verdict should stand (district court applied weight-of-the-evidence/harmless concepts).	Barrett argued the district court applied the wrong standard and urged relief under the materiality/Brady-type test (he also pointed to language suggesting a harmless-beyond-a-reasonable-doubt standard in prior dicta).	The Court held courts must apply the Brady materiality standard (reasonable probability the result would have been different) when exculpatory records are wrongly withheld under §622.10(4); remanded for application.

State v. Neiderbach, 837 N.W.2d 180 (Iowa 2013) (discussed in-camera review and remand procedure under §622.10(4) and noted remedies if records are exculpatory)
DeSimone v. State, 803 N.W.2d 97 (Iowa 2011) (articulates Brady materiality test used in Iowa)
United States v. Bagley, 473 U.S. 667 (U.S. 1985) (defined "reasonable probability" materiality standard for suppressed favorable evidence)
Brady v. Maryland, 373 U.S. 83 (U.S. 1963) (prosecution must disclose exculpatory evidence to defendant under due process)
Pennsylvania v. Ritchie, 480 U.S. 39 (U.S. 1987) (addressed withheld confidential records and discussed new-trial/harmless concepts)
Kyles v. Whitley, 514 U.S. 419 (U.S. 1995) (explains prosecutorial duty to disclose favorable evidence and policy reasons to err on disclosure)
Strickler v. Greene, 527 U.S. 263 (U.S. 1999) (materiality inquiry and its impact on confidence in verdict)
State v. Thompson, 836 N.W.2d 470 (Iowa 2013) (discusses balancing confidentiality and disclosure interests under §622.10(4))