State v. Tucker, 920 N.W.2d 680

Carlos A. Tucker was convicted of one count of first degree sexual assault of a child and two counts of incest based on testimony that, while living with the victims’ mother, he instructed and engaged in sexual acts with M.T. (age 11) and had M.T. engage in sexual acts with her brothers E.T. (12) and R.T. (10).
Physical evidence included semen on the living room rug matching Tucker by autosomal DNA (extremely rare random match probability) and Y-STR DNA recovered from the interior of M.T.’s shorts showing a major male profile matching Tucker.
Tucker moved in limine to exclude the Y-STR DNA evidence under Daubert/Schafersman, arguing unreliability and unfair prejudice (including that jurors would overvalue a Y-STR “match” despite higher coincidental-match probabilities than autosomal testing).
At a Daubert/Schafersman hearing, the State’s DNA analyst explained Y-STR methodology, limitations, and statistical context; the district court admitted the Y-STR evidence and allowed the analyst’s testimony.
The jury convicted on all counts; Tucker was sentenced within statutory limits to consecutive terms (30–50 years for sexual assault; two 10–20 year terms for incest). He appealed challenging (1) admission of Y-STR evidence, (2) sufficiency of the evidence, and (3) sentence excessiveness.

Issue	Plaintiff's Argument (State)	Defendant's Argument (Tucker)	Held
Admissibility of Y-STR DNA evidence	Y-STR is an accepted forensic tool; expert provided methodology and statistical context so probative value justified admission	Y-STR is inherently unreliable and unfairly prejudicial; jurors will overvalue a Y-STR “match”; database/statistics may misrepresent population frequency	Court affirmed admission: Y-STR not inherently unfairly prejudicial; proper statistical context was presented; Daubert/Schafersman challenge fails
Sufficiency of the evidence	Combined testimony, semen on rug matching Tucker, and Y-STR evidence support convictions beyond reasonable doubt	Children’s testimony was inconsistent and not cohesive, so convictions are unsupported	Court affirmed: viewing evidence in prosecution’s favor, a rational juror could find elements proven beyond a reasonable doubt
Sentencing / Excessiveness	Sentence considered statutory factors, defendant’s history, and nature of offenses	Court failed to meaningfully weigh childhood trauma, mental illness, and rehabilitation needs	Court affirmed: sentence within statutory limits and not an abuse of discretion; court considered PSR and relevant factors

Daubert v. Merrell Dow Pharm., 509 U.S. 579 (expert testimony admissibility standard)
Schafersman v. Agland Coop., 262 Neb. 215 (Nebraska Daubert-framework authority)
State v. Trotter, 299 Neb. 392 (standard for reviewing evidentiary rulings)
State v. Johnson, 290 Neb. 862 (need to supply statistical context for DNA evidence)
State v. Wells, 300 Neb. 296 (standard for sufficiency review in criminal cases)
State v. Ortega, 290 Neb. 172 (appellate review of sentences within statutory limits)
State v. Baldwin, 283 Neb. 678 (juror capacity to weigh DNA statistical analysis)
State v. Jones, 296 Neb. 494 (credibility determinations for jury; appellate limits)