State v. Tucker , 301 Neb. 856 ( 2018 )


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    Nebraska Supreme Court A dvance Sheets
    301 Nebraska R eports
    STATE v. TUCKER
    Cite as 
    301 Neb. 856
    State of Nebraska, appellee, v.
    Carlos A. Tucker, appellant.
    ___ N.W.2d ___
    Filed December 14, 2018.   No. S-17-926.
    1.	 Rules of Evidence: Appeal and Error. An appellate court reviews
    for abuse of discretion a trial court’s evidentiary rulings on relevance,
    whether the probative value of evidence is substantially outweighed by
    the danger of unfair prejudice, and the sufficiency of a party’s founda-
    tion for admitting evidence.
    2.	 Expert Witnesses: Appeal and Error. The standard for reviewing the
    admissibility of expert testimony is abuse of discretion.
    3.	 Convictions: Evidence: Appeal and Error. In reviewing a criminal
    conviction for a sufficiency of the evidence claim, whether the evidence
    is direct, circumstantial, or a combination thereof, the standard is the
    same: An appellate court does not resolve conflicts in the evidence, pass
    on the credibility of witnesses, or reweigh the evidence; such matters
    are for the finder of fact. The relevant question for an appellate court
    is whether, after viewing the evidence in the light most favorable to the
    prosecution, any rational trier of fact could have found the essential ele-
    ments of the crime beyond a reasonable doubt.
    4.	 Sentences: Appeal and Error. An appellate court will not disturb a sen-
    tence imposed within the statutory limits absent an abuse of discretion
    by the trial court.
    5.	 Evidence: Words and Phrases. Evidence is relevant if it tends in any
    degree to alter the probability of a material fact.
    6.	 Rules of Evidence. Under Neb. Evid. R. 403, 
    Neb. Rev. Stat. § 27-403
    (Reissue 2016), relevant evidence may be excluded if its probative value
    is substantially outweighed by the danger of unfair prejudice.
    7.	 Evidence. Most, if not all, evidence offered by a party is calculated to
    be prejudicial to the opposing party.
    8.	 Evidence: Words and Phrases. Unfair prejudice means an undue tend­
    ency to suggest a decision based on an improper basis.
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    STATE v. TUCKER
    Cite as 
    301 Neb. 856
    9.	 ____: ____. Unfair prejudice speaks to the capacity of some concededly
    relevant evidence to lure the fact finder into declaring guilt on a ground
    different from proof specific to the offense charged, commonly on an
    emotional basis.
    10.	 Witnesses: Juries: Appeal and Error. The credibility and weight of
    witness testimony are for the jury to determine, and witness credibility
    is not to be reassessed on appellate review.
    11.	 Sentences: Appeal and Error. Where a sentence imposed within the
    statutory limits is alleged on appeal to be excessive, the appellate court
    must determine whether a sentencing court abused its discretion in con-
    sidering and applying the relevant factors as well as any applicable legal
    principles in determining the sentence to be imposed.
    12.	 Sentences. In determining a sentence to be imposed, relevant factors
    customarily considered and applied are the defendant’s (1) age, (2) men-
    tality, (3) education and experience, (4) social and cultural background,
    (5) past criminal record or record of law-abiding conduct, and (6) moti-
    vation for the offense, as well as (7) the nature of the offense and (8) the
    amount of violence involved in the commission of the crime.
    13.	 ____. The appropriateness of a sentence is necessarily a subjective judg-
    ment and includes the sentencing judge’s observation of the defendant’s
    demeanor and attitude and all the facts and circumstances surrounding
    the defendant’s life.
    14.	 ____. Generally, it is within a trial court’s discretion to direct that
    sentences imposed for separate crimes be served either concurrently or
    consecutively.
    Appeal from the District Court for Lancaster County: Darla
    S. Ideus, Judge. Affirmed.
    Joseph D. Nigro, Lancaster County Public Defender, and
    John C. Jorgensen for appellant.
    Douglas J. Peterson, Attorney General, Erin E. Tangeman,
    and, on brief, Sarah E. Marfisi for appellee.
    Heavican, C.J.,            Cassel,      Stacy,     Funke,       Papik,     and
    Freudenberg, JJ.
    Papik, J.
    Carlos A. Tucker appeals his convictions and sentences for
    one count of first degree sexual assault of a child and two
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    STATE v. TUCKER
    Cite as 
    301 Neb. 856
    counts of incest, related to an incident with his girlfriend’s
    children. Evidence at trial showed that Tucker engaged in
    sex acts with M.T., age 11, and that M.T. and her two broth-
    ers, E.T., age 12, and R.T., age 10, engaged in sex acts upon
    Tucker’s instructions. The main issue presented by this appeal
    is whether the district court abused its discretion in admitting
    “Y-STR” DNA evidence over Tucker’s objections. We con-
    clude that it did not. We further reject Tucker’s contentions that
    the evidence was insufficient to support his convictions and
    that the district court imposed excessive sentences. Finding no
    error, we affirm.
    BACKGROUND
    Charges Against Tucker.
    The State charged Tucker with one count of first degree
    sexual assault of a child in violation of 
    Neb. Rev. Stat. § 28-319.01
    (2) (Reissue 2016) and two counts of incest with
    a person under 18 years of age in violation of 
    Neb. Rev. Stat. § 28-703
     (Reissue 2008). The charges arose out of allegations
    by M.T., E.T., and R.T. that Tucker, their mother’s live-in
    ­boyfriend, had engaged in sex acts with M.T. and that M.T. had
    engaged in sex acts with E.T. and R.T. after being instructed to
    do so by Tucker.
    Pretrial Proceedings.
    Prior to trial, Tucker filed a motion in limine seeking
    to exclude all evidence of Y-STR DNA testing pursuant to
    Daubert v. Merrell Dow Pharmaceuticals, Inc., 
    509 U.S. 579
    ,
    
    113 S. Ct. 2786
    , 
    125 L. Ed. 2d 469
     (1993), and Schafersman v.
    Agland Coop, 
    262 Neb. 215
    , 
    631 N.W.2d 862
     (2001) (Daubert/
    Schafersman). He also alleged that such evidence would con-
    fuse the jury and that its prejudicial effect would outweigh its
    probative value.
    At a pretrial hearing on the motion, the district court heard
    expert testimony by Shannen Bishop, a DNA analyst at the
    University of Nebraska Medical Center (UNMC). Bishop testi-
    fied concerning the Y-STR DNA analysis she conducted on
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    STATE v. TUCKER
    Cite as 
    301 Neb. 856
    DNA found on the interior of the shorts M.T. wore on the
    day of the alleged assault. Bishop also explained the origins,
    mechanics, and limitations of Y-STR DNA testing, as well as
    the extent to which it is accepted in the scientific community.
    Bishop testified that Y-STR DNA testing looks only at the male
    chromosome portion of DNA, while autosomal DNA testing
    looks at all 23 chromosomes inherited by each person. She
    dismissed as irrelevant several journal articles submitted by
    Tucker purporting to discredit the application of Y-STR DNA
    testing to small ethnic populations. Bishop explained that the
    articles examined very small, specific sample sizes and that
    Y-STR DNA science has improved since the articles were pub-
    lished in the early 2000’s. She further pointed out that the U.S.
    Y-STR database, which she used in her analysis, was not even
    established when most of the articles were written.
    Following the hearing, the district court denied Tucker’s
    motion in limine. It applied the Daubert/Schafersman analyti-
    cal framework and determined the reasoning and methodology
    behind Bishop’s opinions and Y-STR DNA testing to be valid
    and reliable. The district court further rejected Tucker’s argu-
    ment that the prejudicial effect of Y-STR DNA evidence out-
    weighed its probative value.
    Evidence at Trial.
    At the jury trial, M.T., E.T., and R.T. testified that on the day
    at issue, their mother was at work and Tucker was home with
    them. The children testified that Tucker, then age 31, invited
    them to play a series of games in which he would give the
    winner candy. The games began innocuously enough with the
    children competing to be the last to laugh, but they progressed
    to include the children undressing. In one game, the children
    undressed and Tucker hid their clothes. In another, Tucker
    instructed the children to switch clothing with one another.
    The children testified that after a series of these games,
    Tucker directed them to the living room. Tucker instructed
    the children to disrobe completely, and he played pornography
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    STATE v. TUCKER
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    301 Neb. 856
    on the television. The boys testified that Tucker told them to
    masturbate. All three children testified that at some point while
    they were in the living room, Tucker licked M.T.’s vagina, and
    E.T. and R.T. testified that they followed Tucker’s instructions
    to do the same. The three children testified that Tucker also
    directed M.T. to put her mouth on his penis while, M.T. testi-
    fied, he used his hand to move her head. All three children also
    testified that M.T. complied with Tucker’s instructions to put
    her mouth on E.T.’s and R.T.’s penises as well, with R.T. speci-
    fying that M.T. “suck[ed]” on their penises. There was also
    testimony that Tucker placed an electric toothbrush on M.T.’s
    vagina. The children testified that they saw “white stuff” or
    “clear stuff” come out of Tucker’s penis, which he wiped off
    with a tissue or napkin. R.T. observed some of the fluid from
    Tucker’s penis fall onto the carpet. M.T. and E.T. testified that
    Tucker referred to their activities as “sex ed.”
    During cross-examination, which referenced previous inter-
    views, it was revealed that the children’s testimony contained
    some inconsistencies on such matters as the sequence of the
    games, the objects of the games, their relative stages of undress
    during portions of the games, who won each game, the content
    of the pornography, the sequence of the sex acts, and whether
    sex acts occurred involving M.T.’s breasts or two persons per-
    forming sex acts with M.T. at the same time. However, each
    child testified that on the day in question, M.T. performed fel-
    latio on Tucker and both brothers upon Tucker’s instructions
    and that Tucker performed cunnilingus on M.T.
    Contrary to Tucker’s instructions to the children not to dis-
    close what happened, the children informed their mother. After
    law enforcement was alerted, police conducted a search of the
    residence the children shared with their mother and Tucker.
    They found candy wrappers for the same type of candy the
    children reported Tucker had given to them. A stain found on
    the living room rug tested positive for semen. DNA testing
    showed that the semen had the same genetic profile as Tucker
    and that the probability of randomly selecting an unrelated
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    STATE v. TUCKER
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    individual with a DNA profile matching the sample was 1 in
    752.4 quintillion. The State also introduced Y-STR DNA evi-
    dence found on the shorts M.T. wore on the day of the alleged
    offenses. This evidence is discussed in more detail in the sec-
    tion below.
    Tucker testified in his own behalf. He denied engaging in
    any sex acts with the children.
    Y-STR DNA Evidence.
    The State called Bishop to testify regarding Y-STR DNA
    testing. Tucker’s counsel made a continuing objection to the
    Y-STR DNA testing and any opinions derived from such test-
    ing based on Daubert/Schafersman, because such evidence
    was “inherently unreliable and unfairly prejudicial and other-
    wise not relevant.” The district court overruled the continu-
    ing objection.
    Bishop testified that she is a forensic science DNA analyst
    at UNMC and that she had performed Y-STR DNA testing on
    extractions from the interior of M.T.’s shorts. Bishop stated
    that Y-STR DNA testing was a method of looking only at the
    male Y-chromosome. Bishop explained Y-STR DNA testing
    is often used in sexual assault cases because it can identify a
    male’s contribution to a sample, such as a vaginal swab, that
    may have many more cells from a female contributor than a
    male contributor. Bishop testified that UNMC has performed
    Y-STR DNA analysis since the early 2000’s and that UNMC
    has used the particular Y-STR DNA kit used in this case since
    2012. Bishop stated that Y-STR DNA analysis is an accepted
    forensic tool in the forensic analysis community that has been
    available since the early 2000’s.
    Bishop explained that the Y-STR DNA testing process is
    essentially the same as autosomal DNA testing, but admitted
    that there is a great deal of difference between the discrimi-
    natory power of autosomal DNA testing versus Y-STR DNA
    testing. She testified that autosomal DNA testing can produce
    results showing that a particular profile is extremely rare in the
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    STATE v. TUCKER
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    population, but because the same Y-STR DNA profile is passed
    to all males in the same lineage and additionally may be pres-
    ent in unrelated members of the general population, Y-STR
    DNA testing results will not show that a particular profile is
    as rare. She acknowledged that a coincidental random match
    might occur one in several quintillion times with autosomal
    DNA testing but one in a few thousand times with Y-STR
    DNA testing.
    Bishop testified that Y-STR DNA testing identified Y-STR
    DNA present on the interior of M.T.’s shorts and that it con-
    sisted of a mixture of at least two male individuals. Bishop
    testified that she could not determine what type of cell con-
    tributed the Y-STR DNA profile to M.T.’s shorts or how it was
    deposited there. However, she stated that the major Y-STR
    DNA profile she found on the shorts matched Tucker at all
    of the loci obtained and that, consequently, Tucker was not
    excluded as a potential major source of the DNA tested.
    Bishop testified that to calculate the frequency of Tucker’s
    Y-STR DNA profile within the population, it was necessary
    to consult a database. Bishop testified and her report reflected
    that according to the U.S. Y-STR database, the probability of
    randomly selecting a second individual with the same Y-STR
    DNA profile, given that Tucker expresses such a profile, was 1
    in 1,842 for African Americans. Tucker does not dispute the he
    is African American.
    Bishop’s report reflected that the U.S. Y-STR database was
    maintained by a national institute in the forensic science field.
    Bishop admitted that the U.S. Y-STR database had changed
    since her analysis because it is always gaining contributors.
    She further admitted that it was possible that the more indi-
    viduals that contribute, the better the database will be at dis-
    cerning the likelihood of a particular profile appearing in the
    general population.
    A forensic scientist with the Nebraska State Patrol Crime
    Laboratory’s biology unit also explained the statistical limita-
    tions arising from the patrilineal recurrence of Y-STR DNA
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    and the possible occurrence in the general population, con­
    sistent with Bishop’s testimony.
    Jury Verdict and Sentencing.
    The jury returned a verdict finding Tucker guilty on all
    charges. The district court ordered a presentence investigation
    report (PSR). The PSR reflected that Tucker, then age 33, had
    a traumatic childhood. Tucker’s father was not involved in his
    life, and he reported that he and his 10 siblings all have dif-
    ferent fathers. Tucker grew up in an area where gang crime
    and drugs were prevalent. He reported that his mother was a
    drug user and that he “‘had to find ways to eat and live.’” As
    a child, he witnessed his mother shoot her boyfriend, and he
    developed post-traumatic stress disorder as a result. He has
    also been diagnosed with paranoid schizophrenia, bipolar dis-
    order, and manic depression.
    Tucker has been involved in criminal activity since his
    youth. His criminal history includes a term of probation and
    incarceration for forgery and escape and other jail terms of
    considerable length for theft. His other offenses include a num-
    ber of drug charges, false information, false reporting, failure
    to appear, attempted tampering with a witness, and various
    traffic offenses.
    Tucker had completed an associate degree in theology and
    anthropology, and he wanted to continue his education. At the
    time of the present offenses, he was an owner-employee of an
    aquatic pet store. In the past, Tucker had worked as a dish-
    washer, cook, and telemarketer. When he was not employed, he
    supported himself by selling marijuana.
    The PSR noted that Tucker had refused to take responsibility
    for the crimes charged, consistently maintaining that he had not
    committed them and declining to participate in risk assessment
    for sex offenses. The PSR also included a victim impact letter
    from the children’s mother. She stated that Tucker’s crimes had
    led to a deterioration of her relationships with her children and
    behavior issues.
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    STATE v. TUCKER
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    301 Neb. 856
    At the sentencing hearing, the district court stated that it had
    considered the evidence at trial and the PSR in their entirety,
    particularly Tucker’s pattern of criminal behavior and failure to
    take responsibility for his actions or empathize with the victims
    in this case. The district court noted that its sentencing took
    into account the nature and circumstances of the crimes and
    Tucker’s history, character, and condition.
    The district court sentenced Tucker to 30 to 50 years’
    imprisonment for first degree sexual assault of a child and 10
    to 20 years’ imprisonment for each of the two counts of incest,
    with all sentences to be served consecutively.
    Tucker now appeals his convictions and sentences.
    ASSIGNMENTS OF ERROR
    Tucker assigns, rephrased, (1) that the district court erred
    in admitting unreliable Y-STR DNA evidence, causing undue
    prejudice; (2) that the evidence was insufficient to prove the
    crimes charged; and (3) that the district court abused its discre-
    tion in imposing excessive sentences.
    STANDARD OF REVIEW
    [1] An appellate court reviews for abuse of discretion a trial
    court’s evidentiary rulings on relevance, whether the probative
    value of evidence is substantially outweighed by the danger of
    unfair prejudice, and the sufficiency of a party’s foundation for
    admitting evidence. State v. Trotter, 
    299 Neb. 392
    , 
    908 N.W.2d 656
     (2018).
    [2] The standard for reviewing the admissibility of expert
    testimony is abuse of discretion. State v. Oliveira-Coutinho,
    
    291 Neb. 294
    , 
    865 N.W.2d 740
     (2015).
    [3] In reviewing a criminal conviction for a sufficiency of
    the evidence claim, whether the evidence is direct, circum-
    stantial, or a combination thereof, the standard is the same:
    An appellate court does not resolve conflicts in the evidence,
    pass on the credibility of witnesses, or reweigh the evidence;
    such matters are for the finder of fact. The relevant question
    for an appellate court is whether, after viewing the evidence in
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    the light most favorable to the prosecution, any rational trier
    of fact could have found the essential elements of the crime
    beyond a reasonable doubt. State v. Wells, 
    300 Neb. 296
    , 
    912 N.W.2d 896
     (2018).
    [4] An appellate court will not disturb a sentence imposed
    within the statutory limits absent an abuse of discretion by
    the trial court. State v. Ortega, 
    290 Neb. 172
    , 
    859 N.W.2d 305
     (2015).
    ANALYSIS
    Admissibility of Y-STR DNA Evidence.
    Tucker challenges the admission of the Y-STR DNA testing
    and any opinions derived from such testing. His brief contends
    that the probative value of this evidence was outweighed by
    its prejudicial effect because the evidence is unreliable. We
    understand Tucker to be making two basic arguments against
    the admissibility of the Y-STR DNA evidence. The primary
    argument is a contention that the inherent nature of Y-STR
    DNA evidence makes its admission unfairly prejudicial in any
    case. The second challenges the reliability of the conclusions
    regarding the Y-STR DNA evidence reached in this case. We
    take up each of these contentions in turn.
    [5-9] We first address Tucker’s arguments that the Y-STR
    DNA evidence was unfairly prejudicial. Evidence is relevant if
    it tends in any degree to alter the probability of a material fact.
    State v. Grant, 
    293 Neb. 163
    , 
    876 N.W.2d 639
     (2016). Under
    Neb. Evid. R. 403, 
    Neb. Rev. Stat. § 27-403
     (Reissue 2016),
    relevant evidence may be excluded if its probative value is sub-
    stantially outweighed by the danger of unfair prejudice. Grant,
    
    supra.
     Most, if not all, evidence offered by a party is calculated
    to be prejudicial to the opposing party. State v. Chauncey, 
    295 Neb. 453
    , 
    890 N.W.2d 453
     (2017). Unfair prejudice means an
    undue tendency to suggest a decision based on an improper
    basis. 
    Id.
     It speaks to the capacity of some concededly relevant
    evidence to lure the fact finder into declaring guilt on a ground
    different from proof specific to the offense charged, commonly
    on an emotional basis. 
    Id.
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    Tucker’s primary argument against the admission of the
    Y-STR DNA evidence is that juries will inevitably base their
    decision on an improper basis by incorrectly perceiving the
    Y-STR DNA “match” testimony as conclusively connecting
    the defendant to the sample. Tucker asserts that jurors are
    inclined to think of any evidence of a DNA “match” of having
    an extremely small probability of being the result of coinci-
    dence. But, as he correctly points out, the Y-STR DNA testing
    in this case led to a 1-in-1,842 chance of a coincidental match.
    According to Tucker, this relatively greater chance of a random
    match renders the evidence “completely unreliable.” Brief for
    appellant at 37.
    We have previously recognized a risk that a jury might
    give undue weight to DNA evidence if it is introduced with-
    out proper context. See State v. Johnson, 
    290 Neb. 862
    , 
    862 N.W.2d 757
     (2015). In Johnson, we observed that “‘[b]ecause
    the potential precision of DNA testing is so well known, a
    jury might assume that any DNA profile match is extremely
    unlikely and therefore extremely probative’—even when this
    is not true.” 290 Neb. at 883, 862 N.W.2d at 774, quoting
    Peters v. State, 
    18 P.3d 1224
     (Alaska App. 2001). We have
    not, however, concluded that the appropriate measure to pre-
    vent a jury from making such an assumption is the wholesale
    exclusion of DNA evidence falling below a certain threshold
    of precision. Rather, we have emphasized the need for evi-
    dence of DNA testing to be accompanied by evidence of the
    statistical significance of the findings if it is to be admitted.
    Johnson, supra.
    In this case, Tucker cannot contend that the State sought to
    introduce the Y-STR DNA evidence without the necessary sta-
    tistical context. As we have noted, the State introduced much
    evidence regarding the statistical context for the Y-STR DNA
    evidence. The jury heard explanations of the relative probative
    value of Y-STR DNA testing and autosomal DNA testing. Both
    forensic scientists testified that males share the same Y-STR
    DNA profile with other males in the same paternal lineage,
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    as well as others in the general population. Their testimony
    clearly illustrated that due to this recurrence, Y-STR DNA
    testing results are not as probative as autosomal DNA test-
    ing results. They both explained that Y-STR DNA statistical
    analysis would not render coincidental random match prob-
    abilities such as one in several hundred quintillions, showing a
    particular profile is extremely rare in the population. Instead,
    Bishop testified, Y-STR DNA testing might produce a random
    match probability of one in a few thousand, as it did in this
    case, where Y-STR DNA statistical analysis revealed a 1-in-
    1,842 probability for African-American contributors that a ran-
    dom Y-STR DNA profile unrelated to this case would match
    the profile found on M.T.’s shorts. Because the Y-STR DNA
    testing results were accompanied by the required statistical
    context, its admission was consistent with the principles we set
    forth in Johnson.
    Moreover, we do not believe that Y-STR DNA evidence is
    so unique that something other than the principles of Johnson
    should govern its admissibility. The probabilities of a coinci-
    dental match may be exponentially greater with Y-STR DNA
    evidence than with autosomal DNA evidence, but, if those
    differences are explained to the jury, we see no reason why
    jurors would be incapable of grasping the difference. We have
    previously rejected claims that jurors would not be capable of
    assigning appropriate weight to “the statistical analysis that
    accompanies DNA evidence,” State v. Bauldwin, 
    283 Neb. 678
    ,
    703, 
    811 N.W.2d 267
    , 288 (2012), and reject any suggestion
    that would be the case with Y-STR DNA evidence.
    Y-STR DNA evidence may be less probative than other
    DNA evidence, but if we were to find it inherently prejudicial,
    as Tucker urges, we would be treating such evidence differ-
    ently from other types of evidence that have similar probative
    value and that are introduced for the same purpose. As the
    district court and other courts have observed, Y-STR DNA evi-
    dence can be used in much the same manner as shoe imprint
    evidence. Shoe imprint evidence is routinely admitted to show
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    that an imprint at a crime scene matches shoes owned by a
    defendant even though any number of individuals may own
    shoes identical to the defendant’s.
    The coincidence that [a Y-STR DNA] profile matches that
    of defendant is probative of his guilt in the same man-
    ner as if he had owned shoes that matched a foot imprint
    found at the crime scene. It is up to the jury to weigh the
    probative value of that evidence in light of the fact that
    a significant number of other individuals may possess the
    same profile.
    State v. Calleia, 
    414 N.J. Super. 125
    , 152, 
    997 A.2d 1051
    , 1066
    (2010), reversed on other grounds 
    206 N.J. 274
    , 
    20 A.3d 402
    (2011). See, also, People v. Stevey, 
    209 Cal. App. 4th 1400
    ,
    
    148 Cal. Rptr. 3d 1
     (2012).
    Finally, we note that our conclusion that the Y-STR DNA
    evidence introduced in this case was not unfairly prejudi-
    cial is not a novel conclusion. Courts in a number of other
    states have reached the same conclusion. See, e.g., State v.
    Escalante-Orozco, 
    241 Ariz. 254
    , 
    386 P.3d 798
     (2017), abro-
    gated on other grounds, State v. Escalante, 
    245 Ariz. 135
    ,
    
    425 P.3d 1078
     (2018) (Y-STR profile evidence is not mislead-
    ing, nor is its probative value outweighed by risk of unfair
    prejudice; jury is capable of understanding limited proba-
    tive value of this evidence and giving it whatever weight it
    deserves); State v. Jones, 
    345 P.3d 1195
     (Utah 2015) (Y-STR
    DNA evidence properly explained to jury such that risk of
    unfair prejudice through confusing or misleading jury did not
    substantially outweigh probative value of evidence); People
    v. Wood, 
    307 Mich. App. 485
    , 
    862 N.W.2d 7
     (2014), vacated
    in part on other grounds 
    498 Mich. 914
    , 
    871 N.W.2d 154
    (2015) (limitations of Y-STR DNA testing were presented
    to jury such that there was no danger of confusion or other
    unfair prejudice that would substantially outweigh proba-
    tive value).
    Having rejected Tucker’s argument that Y-STR DNA evi-
    dence is inherently unfairly prejudicial, we move to Tucker’s
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    301 Nebraska R eports
    STATE v. TUCKER
    Cite as 
    301 Neb. 856
    assertion that the testimony offered regarding the Y-STR DNA
    evidence in this case was unreliable. Here, Tucker claims that
    the database used by Bishop to arrive at her statistical conclu-
    sions may not be representative of the population in a given
    area and that therefore, there is a risk that Tucker’s Y-STR
    DNA is even more common than Bishop acknowledged and
    thus there is an even greater chance of a coincidental match.
    This seems to be an attempt at a Daubert/Schafersman chal-
    lenge, even though Tucker’s brief does not cite to Daubert/
    Schafersman or address its framework. But even if we liberally
    construed Tucker’s brief as having framed his argument as a
    Daubert/Schafersman issue, the argument fails.
    Tucker’s argument is premised in part on contentions about
    the U.S. Y-STR database made in articles published in 2003.
    Bishop, however, testified at the Daubert/Schafersman hearing
    that she was familiar with the articles Tucker relies upon. She
    explained that she found these articles to be irrelevant, because
    they were about very small sample sizes and Y-STR DNA sci-
    ence has improved since their publication. In fact, she testified
    that the U.S. Y-STR database upon which she relied was not
    even established at the time the articles upon which Tucker
    bases his challenge were written. The remaining article Tucker
    cites to support this argument was not presented to the district
    court and is not in the record before us for consideration. See
    State v. Patton, 
    287 Neb. 899
    , 
    845 N.W.2d 572
     (2014) (party’s
    brief may not expand evidentiary record). Given Bishop’s tes-
    timony concerning the articles Tucker offered to the district
    court, we see no abuse of discretion in the admission of the
    Y-STR DNA evidence.
    In sum, we conclude that the Y-STR DNA evidence in this
    case did not suggest a decision based on an improper basis and
    that thus, its prejudicial effect did not outweigh its probative
    value. Moreover, Tucker’s Daubert/Schafersman arguments
    also fail. Therefore, the district court did not abuse its discre-
    tion in admitting such evidence at trial.
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    301 Nebraska R eports
    STATE v. TUCKER
    Cite as 
    301 Neb. 856
    Sufficiency of Evidence.
    We next address Tucker’s argument that the evidence was
    not sufficient to support his convictions. The relevant ques-
    tion when such a challenge is made is “whether, after viewing
    the evidence in the light most favorable to the prosecution,
    any rational trier of fact could have found the essential ele-
    ments of the crime beyond a reasonable doubt.” State v.
    McCurdy, ante p. 343, 351, 
    918 N.W.2d 292
    , 298 (2018).
    Tucker, however, does not contend that there was no evidence
    of the essential elements of either first degree sexual assault
    of a child or incest. And, given the testimony at trial that
    Tucker penetrated M.T.’s mouth with his penis when M.T.
    was 11 years old and Tucker was 31 years old; that Tucker
    performed cunnilingus on M.T.; that Tucker placed an electric
    toothbrush on M.T.’s vagina; and that upon Tucker’s instruc-
    tions, M.T. performed fellatio on E.T. and R.T., and E.T. and
    R.T. performed cunnilingus on M.T., such an argument is not
    available to him.
    Instead, Tucker argues that because the children “did not
    testify to a cohesive story either individually or collectively,”
    brief for appellant at 43, no rational juror could have found
    Tucker guilty beyond a reasonable doubt. In other words,
    Tucker is asking us to reweigh the evidence and find that the
    testimony of the children was not credible. “But that is not the
    role of an appellate court.” State v. Jones, 
    296 Neb. 494
    , 499,
    
    894 N.W.2d 303
    , 307 (2017).
    [10] The credibility and weight of witness testimony are
    for the jury to determine, and witness credibility is not to be
    reassessed on appellate review. State v. Archie, 
    273 Neb. 612
    ,
    
    733 N.W.2d 513
     (2007). Our task is limited to determining
    whether, after viewing the evidence in the light most favorable
    to the prosecution, any rational trier of fact could have found
    beyond a reasonable doubt that Tucker committed the charged
    offenses. See 
    id.
     Based on the evidence summarized above,
    we conclude it could.
    - 871 -
    Nebraska Supreme Court A dvance Sheets
    301 Nebraska R eports
    STATE v. TUCKER
    Cite as 
    301 Neb. 856
    Excessive Sentences.
    Finally, we address Tucker’s claim that he received exces-
    sive sentences. Tucker does not dispute that the sentences
    imposed were within statutory limits. Rather, he argues only
    that the district court did not meaningfully consider his child-
    hood trauma, mental condition, and need for rehabilitation. We
    conclude that the district court did not abuse its discretion in
    sentencing Tucker.
    [11-14] Where a sentence imposed within the statutory
    limits is alleged on appeal to be excessive, the appellate court
    must determine whether a sentencing court abused its discre-
    tion in considering and applying the relevant factors as well as
    any applicable legal principles in determining the sentence to
    be imposed. State v. Russell, 
    299 Neb. 483
    , 
    908 N.W.2d 669
    (2018). Relevant factors customarily considered and applied
    are the defendant’s (1) age, (2) mentality, (3) education and
    experience, (4) social and cultural background, (5) past crimi-
    nal record or record of law-abiding conduct, and (6) motiva-
    tion for the offense, as well as (7) the nature of the offense
    and (8) the amount of violence involved in the commission of
    the crime. 
    Id.
     The appropriateness of a sentence is necessar-
    ily a subjective judgment and includes the sentencing judge’s
    observation of the defendant’s demeanor and attitude and all
    the facts and circumstances surrounding the defendant’s life.
    State v. Steele, 
    300 Neb. 617
    , 
    915 N.W.2d 560
     (2018). And
    generally, it is within a trial court’s discretion to direct that
    sentences imposed for separate crimes be served either concur-
    rently or consecutively. State v. Leahy, ante p. 228, 
    917 N.W.2d 895
     (2018).
    Our review of the record demonstrates that the district court
    properly considered and applied the necessary sentencing fac-
    tors. The PSR shows that Tucker exhibited mental illness after
    having grown up in an environment of poverty, crime, drug
    use, instability, and trauma. Certainly, these disadvantages
    were relevant to the sentencing calculus, but the district court
    stated that it considered the PSR in its entirety, and we have
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    Nebraska Supreme Court A dvance Sheets
    301 Nebraska R eports
    STATE v. TUCKER
    Cite as 
    301 Neb. 856
    no reason to believe the district court did not weigh those dis-
    advantages against other factors. Those other factors, however,
    would include Tucker’s significant pattern of criminal behav-
    ior and the nature of the offenses at issue. On this point, the
    record shows that Tucker’s crimes against the children in this
    case were particularly serious. Tucker used games and candy to
    systematically lure children in his care into participating in acts
    that will have a lasting negative impact on their lives. And as
    the district court emphasized, Tucker has not taken responsibil-
    ity for his actions.
    Having reviewed the record and the district court’s remarks
    in light of the familiar sentencing factors set forth above, we
    conclude that the district court did not abuse its discretion in
    sentencing Tucker within statutory limits.
    CONCLUSION
    We conclude that the district court did not abuse its discre-
    tion in admitting Y-STR DNA evidence at trial. We further
    determine that the evidence presented at trial was sufficient
    to support Tucker’s convictions and that the district court
    did not abuse its discretion in sentencing him. Consequently,
    we affirm.
    A ffirmed.
    Miller-Lerman, J., not participating.