United States v. Robert Kelsey, 917 F.3d 740

Victim S.H., an 11-year-old, met defendant Robert Kelsey via Instagram; Kelsey (using the name “Kevin”) drove her from summer camp to his father’s house and had sexual intercourse with her.
S.H. reported the assault; police collected a sexual-assault kit and showed a six-photo array to S.H. five days later, from which she identified Kelsey quickly and signed the photo.
DNA from S.H.’s kit was processed by the D.C. Department of Forensic Sciences (bench work by technician Shana Mills) and analyzed for matching by Bode Technology (expert Hope Parker), who concluded the male DNA matched Kelsey.
Kelsey gave a recorded, noncustodial statement at a police station after waiving Miranda; he said he had driven a girl for his cousin “Kevin.” He left after phone calls with his attorney.
At trial the government introduced the photo-array ID, the recorded statement, and DNA evidence; Kelsey was convicted of transporting a minor for sexual activity and related sexual-offense charges.
On appeal Kelsey challenged (1) lay testimony by Mills as impermissible expert testimony and exclusion of cross-examining her about D.C. lab mixture-analysis problems, (2) the suggestiveness of the photo array, and (3) voluntariness of his statements to police.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Admissibility of Mills’ testimony (expert vs. lay)	Government: Mills was a fact witness about bench work and chain of custody, not an expert offering comparative analysis.	Kelsey: Mills impermissibly offered expert comparisons of raw data to Bode’s data without qualification, foreclosing cross-examination on lab errors.	Court: Mills permissibly testified as a lay witness about raw data/bench work; any error would be harmless.
Scope of cross-examination about D.C. lab mixture-analysis problems	N/A (gov’t opposed probing irrelevant historical errors)	Kelsey: Should be able to explore lab’s past mixture-analysis errors to impeach Mills’ credibility.	Court: Preclusion not abusive; past mixture-analysis issues were irrelevant to Mills’ bench work and would not be productive; no prejudice.
Photo-array suggestiveness and admissibility	N/A	Kelsey: Photo array suggestive (ear tattoo unique), undermining reliability of S.H.’s ID.	Court: Array not impermissibly suggestive—the tattoo was not clearly discernible; even if suggestive, other reliability factors and corroborating evidence rendered any error harmless.
Voluntariness of Kelsey’s recorded statement	N/A	Kelsey: Interview continued after he said he would feel better with counsel present, so subsequent statements involuntary.	Court: Statement voluntary—noncustodial, Miranda given and waived, officer noncoercive, calls with counsel occurred, defendant free to leave.

Kumho Tire Co. v. Carmichael, 526 U.S. 137 (discretionary Daubert gatekeeping applies to expert testimony)
Daubert v. Merrell Dow Pharm., Inc., 509 U.S. 579 (trial courts must assess admissibility of expert scientific testimony)
Kotteakos v. United States, 328 U.S. 750 (harmless-error standard for nonconstitutional errors)
Manson v. Brathwaite, 432 U.S. 98 (test for reliability of eyewitness identification despite suggestive procedures)
Neil v. Biggers, 409 U.S. 188 (factors for evaluating reliability of eyewitness identifications)
Dickerson v. United States, 530 U.S. 428 (Miranda and voluntariness principles)
Lego v. Twomey, 404 U.S. 477 (government bears burden to prove voluntariness by preponderance)
United States v. Rattler, 475 F.3d 408 (D.C. Cir. two-step due-process analysis for identification challenges)