SANDSTROM, Justice.
[¶ 1] M.D. appeals a district court order denying his petition for discharge from commitment as a sexually dangerous individual. We affirm.
I
[¶ 2] In 1998, M.D. was civilly committed as a sexually dangerous individual, and this Court affirmed the district court’s commitment order. Interest of M.D., 1999 ND 160, 598 N.W.2d 799.
[¶ 3] For the first time since his commitment, M.D. petitioned for discharge in 2007 under N.D.C.C. § 25-03.3-18(1); a discharge hearing was held in March 2008. The district court appointed Dr. Robert G. Riedel as M.D.’s independent expert evaluator. On behalf of the State, Dr. Lynne Sullivan conducted a sexually dangerous individual annual reevaluation of M.D. The two experts disagreed about whether M.D. remains a sexually dangerous individual. Dr. Riedel testified M.D. is not a sexually dangerous individual, because he is not likely to engage in further acts of sexually predatory conduct. Dr. Riedel based his opinion mainly on the scores of several actuarial instruments he administered, including MnSOST-R, RRASOR, and Static-99, which showed a low to moderate risk of reoffending. He also conducted a two-hour interview with M.D. and reviewed M.D.’s chart, expressing concerns regarding several inconsistencies. Dr. Sullivan, on the other hand, testified M.D. remains a sexually dangerous individual on the basis of M.D.’s chart notes from 2007, which indicated not only that M.D. had not completed sex offender treatment but that, in fact, he had regressed in his treatment. Dr. Sullivan’s reevaluation report also indicated that M.D. had engaged in a secret, against-the-treatment-rules, 18-month-long homosexual relationship with a young-looking resident and that he had made several troubling comments related to his sexual drive and history as a sex offender. Dr. Sullivan testified M.D.’s treatment provider had explained to her that after M.D. caused distractions during treatment sessions, she asked M.D. to remove himself from the treatment group, but not from the room; he was assigned other tasks such as taking notes from the group discussions in order to participate in the therapy sessions. M.D. was requested to remove himself because, in the treatment provider’s opinion, M.D. was engaging in sexual fantasies about other residents’ disclosure of their past sexual offenses and about two young-looking residents participating in the group. Dr. Sullivan testified the combination of M.D.’s sexual and personality disorder, his lack of motivation to complete treatment, his statements about his sexual drive, and his rule-breaking behavior of engaging in sexual relationships with other residents indicates he is at high [561]*561risk of reoffending, has serious difficulty controlling his behavior, and may not be really motivated to change that behavior. In Dr. Sullivan’s professional opinion, M.D. has not progressed in his treatment to the point that his reoffending would be less than likely.
[¶ 4] After considering the testimony of the two experts, the district court found M.D. continues to be a sexually dangerous individual, and denied his petition for discharge on March 25, 2008.
[¶ 5] The district court had jurisdiction of the discharge hearing under N.D. Const, art. VI, § 8, and N.D.C.C. § 25-03.3-02. The appeal from the order was timely under N.D.C.C. § 25-03.3-19. This Court has jurisdiction under N.D. Const, art. VI, §§ 2 and 6, and N.D.C.C. § 25-03.3-19.
II
[¶ 6] On appeal, M.D. argues the State did not prove by clear and convincing evidence that he is likely to commit further sexually predatory acts.
[¶ 7] Under a modified clearly erroneous standard, we affirm a district court order denying a petition for discharge from commitment as a sexually dangerous individual unless it is induced by an erroneous view of the law or we are firmly convinced it is not supported by clear and convincing evidence. Matter of E.W.F., 2008 ND 130, ¶ 8, 751 N.W.2d 686. The State must prove by clear and convincing evidence that the committed individual remains a sexually dangerous individual. N.D.C.C. § 25-03.3-18(4). A sexually dangerous individual is a person who:
“[has] engaged in sexually predatory conduct ... has a congenital or acquired condition that is manifested by a sexual disorder, a personality disorder, or other mental disorder or dysfunction that makes that individual likely to engage in further acts of sexually predatory conduct which constitute a danger to the physical or mental health or safety of others.”
N.D.C.C. § 25-03.3-01(8). In Kansas v. Crane, 534 U.S. 407, 413, 122 S.Ct. 867, 151 L.Ed.2d 856 (2002), the United States Supreme Court concluded that commitment as a sexually dangerous individual cannot constitutionally be sustained without determining that the person to be committed has serious difficulty in controlling his or her behavior. Therefore, consistent with N.D.C.C. § 1-02-38(1), we have construed the definition of a sexually dangerous .individual to require that there must be a nexus between the disorder and dangerousness, proof of which encompasses evidence showing the individual has serious difficulty in controlling his behavior, which suffices to distinguish a sexually dangerous individual from other dangerous persons. Matter of G.R.H., 2006 ND 56, ¶ 18, 711 N.W.2d 587. In cases of conflicting testimony, the district court is the best credibility evaluator. Matter of Hehn, 2008 ND 36, ¶ 23, 745 N.W.2d 631. “It is not the function of this Court to second-guess the credibility determinations made by the trial court.” Id.
[¶ 8] M.D. does not dispute that he previously has engaged in predatory conduct, and has conceded that he has been diagnosed with disorders that meet the criteria under the second prong of N.D.C.C. § 25-03.3-01(8). M.D. instead argues the State failed to prove, by clear and convincing evidence, that he is likely to engage in further acts of sexually predatory conduct.
[¶ 9] M.D. argues his case is unique because he was the first person to be committed as a sexually dangerous individual under Chapter 25-03.3 of the North [562]*562Dakota Century Code, and his original commitment was based mainly on the evaluators’ reasoning and assessment without much reliance on risk assessment instruments. He contends Dr. Riedel’s assessment of the likelihood of his reoffending on the basis of risk assessment inventories is more reliable because nearly all authorities on the subject advocate their use, or a mixture of risk assessment inventories and clinical judgments. Dr. Riedel testified M.D. is not likely to reoffend, mostly because M.D. scored low to moderate in all the risk assessment instruments he administered, such as the MnSOST-R, RRA-SOR, and Static-99.
[¶ 10] We have previously explained, “The fact that ... actuarial test scores [do] not give rise to scores showing a high risk of re-offending does not preclude the fact-finder from coming to an alternative conclusion.” Matter of Hehm, 2008 ND 36, ¶ 21, 745 N.W.2d 631. That the actuarial tests do not indicate an individual is “statistically likely to re-offend is of little consequence,” because the ultimate decision to determine whether there is clear and convincing evidence sufficient for commitment rests with the district court. Id.
[¶ 11] In this case, the district court was presented with clear and convincing evidence that M.D. is likely to commit further acts of sexually predatory conduct.
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SANDSTROM, Justice.
[¶ 1] M.D. appeals a district court order denying his petition for discharge from commitment as a sexually dangerous individual. We affirm.
I
[¶ 2] In 1998, M.D. was civilly committed as a sexually dangerous individual, and this Court affirmed the district court’s commitment order. Interest of M.D., 1999 ND 160, 598 N.W.2d 799.
[¶ 3] For the first time since his commitment, M.D. petitioned for discharge in 2007 under N.D.C.C. § 25-03.3-18(1); a discharge hearing was held in March 2008. The district court appointed Dr. Robert G. Riedel as M.D.’s independent expert evaluator. On behalf of the State, Dr. Lynne Sullivan conducted a sexually dangerous individual annual reevaluation of M.D. The two experts disagreed about whether M.D. remains a sexually dangerous individual. Dr. Riedel testified M.D. is not a sexually dangerous individual, because he is not likely to engage in further acts of sexually predatory conduct. Dr. Riedel based his opinion mainly on the scores of several actuarial instruments he administered, including MnSOST-R, RRASOR, and Static-99, which showed a low to moderate risk of reoffending. He also conducted a two-hour interview with M.D. and reviewed M.D.’s chart, expressing concerns regarding several inconsistencies. Dr. Sullivan, on the other hand, testified M.D. remains a sexually dangerous individual on the basis of M.D.’s chart notes from 2007, which indicated not only that M.D. had not completed sex offender treatment but that, in fact, he had regressed in his treatment. Dr. Sullivan’s reevaluation report also indicated that M.D. had engaged in a secret, against-the-treatment-rules, 18-month-long homosexual relationship with a young-looking resident and that he had made several troubling comments related to his sexual drive and history as a sex offender. Dr. Sullivan testified M.D.’s treatment provider had explained to her that after M.D. caused distractions during treatment sessions, she asked M.D. to remove himself from the treatment group, but not from the room; he was assigned other tasks such as taking notes from the group discussions in order to participate in the therapy sessions. M.D. was requested to remove himself because, in the treatment provider’s opinion, M.D. was engaging in sexual fantasies about other residents’ disclosure of their past sexual offenses and about two young-looking residents participating in the group. Dr. Sullivan testified the combination of M.D.’s sexual and personality disorder, his lack of motivation to complete treatment, his statements about his sexual drive, and his rule-breaking behavior of engaging in sexual relationships with other residents indicates he is at high [561]*561risk of reoffending, has serious difficulty controlling his behavior, and may not be really motivated to change that behavior. In Dr. Sullivan’s professional opinion, M.D. has not progressed in his treatment to the point that his reoffending would be less than likely.
[¶ 4] After considering the testimony of the two experts, the district court found M.D. continues to be a sexually dangerous individual, and denied his petition for discharge on March 25, 2008.
[¶ 5] The district court had jurisdiction of the discharge hearing under N.D. Const, art. VI, § 8, and N.D.C.C. § 25-03.3-02. The appeal from the order was timely under N.D.C.C. § 25-03.3-19. This Court has jurisdiction under N.D. Const, art. VI, §§ 2 and 6, and N.D.C.C. § 25-03.3-19.
II
[¶ 6] On appeal, M.D. argues the State did not prove by clear and convincing evidence that he is likely to commit further sexually predatory acts.
[¶ 7] Under a modified clearly erroneous standard, we affirm a district court order denying a petition for discharge from commitment as a sexually dangerous individual unless it is induced by an erroneous view of the law or we are firmly convinced it is not supported by clear and convincing evidence. Matter of E.W.F., 2008 ND 130, ¶ 8, 751 N.W.2d 686. The State must prove by clear and convincing evidence that the committed individual remains a sexually dangerous individual. N.D.C.C. § 25-03.3-18(4). A sexually dangerous individual is a person who:
“[has] engaged in sexually predatory conduct ... has a congenital or acquired condition that is manifested by a sexual disorder, a personality disorder, or other mental disorder or dysfunction that makes that individual likely to engage in further acts of sexually predatory conduct which constitute a danger to the physical or mental health or safety of others.”
N.D.C.C. § 25-03.3-01(8). In Kansas v. Crane, 534 U.S. 407, 413, 122 S.Ct. 867, 151 L.Ed.2d 856 (2002), the United States Supreme Court concluded that commitment as a sexually dangerous individual cannot constitutionally be sustained without determining that the person to be committed has serious difficulty in controlling his or her behavior. Therefore, consistent with N.D.C.C. § 1-02-38(1), we have construed the definition of a sexually dangerous .individual to require that there must be a nexus between the disorder and dangerousness, proof of which encompasses evidence showing the individual has serious difficulty in controlling his behavior, which suffices to distinguish a sexually dangerous individual from other dangerous persons. Matter of G.R.H., 2006 ND 56, ¶ 18, 711 N.W.2d 587. In cases of conflicting testimony, the district court is the best credibility evaluator. Matter of Hehn, 2008 ND 36, ¶ 23, 745 N.W.2d 631. “It is not the function of this Court to second-guess the credibility determinations made by the trial court.” Id.
[¶ 8] M.D. does not dispute that he previously has engaged in predatory conduct, and has conceded that he has been diagnosed with disorders that meet the criteria under the second prong of N.D.C.C. § 25-03.3-01(8). M.D. instead argues the State failed to prove, by clear and convincing evidence, that he is likely to engage in further acts of sexually predatory conduct.
[¶ 9] M.D. argues his case is unique because he was the first person to be committed as a sexually dangerous individual under Chapter 25-03.3 of the North [562]*562Dakota Century Code, and his original commitment was based mainly on the evaluators’ reasoning and assessment without much reliance on risk assessment instruments. He contends Dr. Riedel’s assessment of the likelihood of his reoffending on the basis of risk assessment inventories is more reliable because nearly all authorities on the subject advocate their use, or a mixture of risk assessment inventories and clinical judgments. Dr. Riedel testified M.D. is not likely to reoffend, mostly because M.D. scored low to moderate in all the risk assessment instruments he administered, such as the MnSOST-R, RRA-SOR, and Static-99.
[¶ 10] We have previously explained, “The fact that ... actuarial test scores [do] not give rise to scores showing a high risk of re-offending does not preclude the fact-finder from coming to an alternative conclusion.” Matter of Hehm, 2008 ND 36, ¶ 21, 745 N.W.2d 631. That the actuarial tests do not indicate an individual is “statistically likely to re-offend is of little consequence,” because the ultimate decision to determine whether there is clear and convincing evidence sufficient for commitment rests with the district court. Id.
[¶ 11] In this case, the district court was presented with clear and convincing evidence that M.D. is likely to commit further acts of sexually predatory conduct. The evidence shows that M.D. has not completed sex offender treatment since his commitment in 1998. Both Dr. Sullivan and Dr. Riedel agreed that successful treatment completion decreases the likelihood of reoffending. In fact, this Court in Matter of Barrera concluded expert testimony established that a committed sex offender’s failure to complete sex offender treatment and an alcohol treatment program increased his risk levels overall. 2008 ND 25, ¶ 13, 744 N.W.2d 744. Although M.D. attributed his failure to progress in treatment to the way he was treated by the treatment provider from November 2006 to January 2007, the evidence showed that he had not been excluded from treatment — while not included in the group discussions, he was assigned to take notes from the group and state what he had learned from each group session. According to Dr. Sullivan, M.D. continues to show symptoms of attraction to adolescent males — the peer with whom M.D. had an 18-month-long sexual relationship while in treatment was reported to bear a strong physical resemblance to an adolescent male. Moreover, M.D. has reportedly not done anything to lower his high risk of future sexually predatory conduct. In light of M.D.’s failure to progress in treatment, his sexual relationship with a young-looking resident in violation of the treatment program rules, and his lack of empathy for his victims, we are convinced that the district court order is supported by clear and convincing evidence. The evidence also shows that M.D. has serious difficulty controlling his behavior, which is what distinguishes a sexually dangerous individual from the “ ‘dangerous but typical recidivist convicted in an ordinary criminal case.’ ” Matter of Hehn, 2008 ND 36, ¶ 19, 745 N.W.2d 631 (quoting Kansas v. Crane, 534 U.S. 407, 413, 122 S.Ct. 867, 151 L.Ed.2d 856 (2002)).
Ill
[¶ 12] We affirm the district court order denying M.D.’s petition for discharge from his commitment as a sexually dangerous individual.
[¶ 13] GERALD W. VANDE WALLE, G.J., DANIEL J. CROTHERS, and MARY MUEHLEN MARING, JJ., concur.