Can trial courts admit DNA evidence without formal lab reports? State v. Lievanos Explained

In State v. Lievanos, the Utah Court of Appeals addressed when trial courts may admit DNA expert testimony that relies on updated statistical calculations provided informally rather than through revised laboratory reports. The decision clarifies the scope of judicial gatekeeping under Rule 702 of the Utah Rules of Evidence.

Background and Facts

Lievanos was convicted of multiple felonies arising from a home invasion where victims were held at gunpoint while intruders ransacked the house. Police found Lievanos hiding nearby with evidence linking him to the crime, including a cell phone with a mariachi ringtone and a companion covered in white wax that had spilled during the invasion. A DNA analyst initially concluded that DNA found on a ski mask and gloves had a significant statistical match to Lievanos’s profile. However, before trial, new guidelines from the Scientific Working Group on DNA Analysis Methods led the analyst to recalculate the statistics. She provided the updated numbers via email rather than issuing a new formal report, explaining this practice was consistent with crime lab procedures since the underlying DNA data remained unchanged.

Key Legal Issues

The central issue was whether the trial court abused its discretion in refusing to strike the DNA analyst’s testimony under Rule 702 when she relied on updated statistical calculations provided by email rather than through a new formal laboratory report that underwent technical review.

Court’s Analysis and Holding

The court applied the abuse of discretion standard for trial court decisions on expert testimony admissibility. Drawing from Gunn Hill Dairy, the court emphasized that trial courts have only a preliminary obligation to determine whether expert testimony meets a “threshold showing” of reliability—defined as a “basic foundational showing of reliability.” Once this threshold is met, the ultimate reliability determination belongs to the jury. The court found the analyst’s testimony met this standard because she followed established crime lab procedures, and the informal reporting method was consistent with lab practices when applying new guidelines to previously completed analyses.

Practice Implications

This decision reinforces that Rule 702’s gatekeeping function requires only a basic showing of reliability, not perfect adherence to ideal scientific practices. Attorneys challenging DNA evidence should focus on fundamental methodological flaws rather than procedural variations that remain within accepted laboratory practices. The ruling also demonstrates the importance of making specific objections under Rule 702 rather than general challenges to expert testimony.