OPINION
{1 Ryan Daniel Mills appeals from his convictions on three counts of unlawful sexual conduct with a sixteen or seventeen year old, see Utah Code Ann. § 76-5-401.2 (2008); one count of enticing a minor, see id. § 76-4-401; five counts of sexual exploitation of a minor, see id. § 76-5a-8 (current version at id. § 76-5b-201 (2012)); and one count of rape, see id. § 76-5-402 (2008). We affirm.
BACKGROUND 1
2 In January 2009, Mills was in Utah on leave from his active duty Army posting in Louisiana when he ran into sixteen-year-old C.D. at a grocery store in Duchesne. Mills, who was twenty-eight years old at the time, knew C.D. as the daughter of his brother's ex-wife. Mills flirted with C.D., and the two began texting each other regularly. Over the next few weeks, Mills pursued a relationship with C.D., and Mills and C.D. had sex several times before Mills returned to Louisiana in February.
T3 Mills and C.D. continued to communicate by text and by phone. C.D. sent Mills pictures of herself from her cell phone, and Mills asked C.D. to send him nude pictures. At first, C.D. refused, but Mills persisted, telling C.D. that it would be "a good way to keep our relationship good." C.D. eventually gave in to Mills's requests, and she sent him five different pictures of herself nude from the waist up over the course of the next several weeks.
T4 Mills drove back to Utah on leave in June 2009. He immediately went to visit C.D., and the two once again had sex. However, the subject of sex had become a point of contention in the relationship, and after-wards, the two argued about Mills's motives. A few days before the Fourth of July, Mills went to C.D.'s home, and C.D. agreed to let him spend the night as long as he promised that they would not have sex. Mills promised that they would not, but when the two went to bed, Mills began making physical advances. C.D. repeatedly told Mills to stop and tried to push him away, but Mills held her down and forced himself on her. When C.D. confronted Mills in the morning, he first denied having had sex with her, and then told her that he must have been sleeping. C.D. and Mills did not have sex again, and before Mills left for Louisiana, C.D. borrowed his computer and deleted a folder containing pictures of her, including at least two of the topless pictures she had sent him.
1 5 C.D. did not report the rape to authorities until April 2010, after Mills persisted in texting her despite her demands that he stop. Detective Wade Butterfield of the Du-chesne County Sheriffs Office was assigned to the case, and he interviewed C.D. on April 8. Butterfield then began attempting to contact Mills, who by this time was stationed in South Carolina. Butterfield finally spoke to Mills by phone on April 29, at which time Mills admitted to having had consensual sex with C.D. Also on April 29, the State charged Mills by information with fifteen crimes arising from his interactions with C.D. The State seized Mills's computer pursuant to a warrant and sent it to a forensic facility for examination. No pictures of C.D. were ever recovered from the computer.
T6 Mills's preliminary hearing was set for July 8, 2010, but was continued several times at Mills's request. The hearing was finally
17 On December 9, 2010, forty-one days prior to trial, the State filed a notice that identified two proposed expert witnesses who had participated in the forensic analysis of Mills's computer. However, on January 13, 2011, the State notified defense counsel that no evidence had been found on Mills's computer and that the State no longer intended to call its expert witnesses. Mills responded by seeking a continuance of trial because, among other reasons, the State had not provided him with copies of the experts' reports. On the morning of the scheduled January 19 trial, the State confirmed that it would not be calling the expert witnesses. The district court granted Mills's motion for a continuance and rescheduled the trial for February 15, The district court indicated that there would be no further continuances. Later in the day on January 19, the State provided Milis with copies of the experts' reports.
T8 On the first morning of trial, Mills again raised the expert witness issue, arguing that he had not been provided with the expert witnesses' reports thirty days prior to trial as required by Utah law. The district court expressed to the parties that the State's failure to timely disclose the expert reports would likely preclude the State from calling those witnesses but did not present a problem in light of the State's decision to not call them. Nevertheless, the district court invited Mills to "make a motion on Rule 16," referring to the criminal rule governing discovery. See Utah R.Crim. P. 16. Mills's counsel responded, "I think we can move forward," and then confirmed the district court's observation that he was waiving the issue. Shortly thereafter, when the district court refused to allow Mills to call the two experts as defense witnesses due to Mills's own failure to provide notice, Mills's counsel attempted to retract his waiver. The district court denied the motion to retract the waiver, and no motion for continuance was ever made.
T9 Trial proceeded, with C.D. and Butter-field providing the only testimony in the State's case in chief, C.D. described the various sex acts that had occurred, including the alleged rape. The State did not produce the nude pictures of C.D. that gave rise to the sexual exploitation counts, but C.D. described each of the five images in detail and testified that each depicted her bare breasts. C.D. testified that she took the pictures and sent them to Mills over the course of several months at his repeated requests. She also testified that she later deleted the pictures from Mills's computer in Utah, stating that "there was a folder with my name on it and it had pictures of me clothed and pictures of me nude. I just deleted the whole folder." However, when asked specifically if she had seen any of the five nude pictures on Mills's computer, she answered only that she had seen "two of them in the little thumbnails on the folder." The jury also heard the audio recording of Butterfield's phone interview with Mills, as well as defense testimony from another detective, from Mills's brother, and from Mills himself.
{10 Near the end of trial, Mills made a motion to dismiss the five sexual exploitation of a minor counts. Mills argued that the State had not actually produced the nude pictures of C.D. at trial and that there was
I'm going to deny the motion. I believe there's enough evidence to go to-to the jury. The young lady said that she viewed pictures that she erased on the computer in Duchesne County. So you're making it on a jurisdictional issue based upon the fact that he was in another state. Also, I believe jurisdictionally, if they were created in Utah and sent, Utah has-has joint jurisdiction with where they were sent to. So I will deny your motion at this point in time.
The jury convicted Mills on all charges, and he now appeals.
ISSUES AND STANDARDS OF REVIEW
(111 Mills first argues that the district court should have suppressed his phone interview with Butterfield. Mills argues that the interview constituted a custodial interrogation that entitled him to Miranda warnings and that he did not waive his Sixth Amendment right to have the assistance of counsel during the interview. "We review determinations of custodial interrogation for correctness, giving no deference to the trial court's decision." State v. Butt,
112 Second, Mills argues that the State's failure to provide full and timely notice of its proposed expert witnesses deprived Mills of his due process rights to confront the witnesses against him and to present exculpatory evidence. Issues that implicate the district court's refusal to grant a continuance are reviewed only for abuse of discretion. See State v. Torres-Garcia,
113 Third, Mills argues that the district court lacked criminal jurisdiction over at least three of his five sexual exploitation of a minor convictions because the evidence shows that Mills possessed only two of the five nude images of C.D. within the state of Utah. Whether the district court had eriminal jurisdiction is a question of law, which we review for correctness. See State v. Holm,
114 Finally, Mills argues that there was insufficient evidence to support any of the sexual exploitation of a minor convictions because the State could not actually produce the nude pictures of C.D. and instead relied only on her descriptions of those images. When a defendant challenges the sufficiency of the evidence to support a jury verdict, "we review the evidence and all inferences which may reasonably be drawn from it in the light most favorable to the verdict." State v. Hirschi,
ANALYSIS
I. Suppression Issues
{15 Mills argues that the district court should have suppressed all evidence arising from his April 29, 2010 phone conversation with Detective Butterfield. Mills first argues that the conversation was a custodial interrogation for purposes of Miranda v. Arizona,
116 Persons "subjected to custodial interrogation" are entitled to the Miranda warnings in order to preserve their Fifth Amendment right against self-incrimination. See State v. Butt,
117 "Custodial interrogation" requires both custody and interrogation, see Butt,
1 18 Despite our skepticism that Miranda custody can be effectuated over the phone, we will evaluate Mills's argument under the standards established by Utah case law.
The Utah Supreme Court has identified four factors that aid in determining whether a person is in custody for Miranda purposes: "(1) the site of interrogation; (2) whether the investigation focused on the accused; (8) whether the objective indicia of arrest were present; and (4) the length and form of interrogation."
Maestas,
119 Mills argues that the first factor, the site of the interrogation, favors a finding of custody because Butterfield had attempted to call him so often that Mills "felt that he had to answer the phone call in order to stop the phone calls from interrupting his day to day duties." Mills further states that the "site of interrogation was compounded by [Mills] being on a military base," "where different rules and standards apply." We are unpersuaded by these arguments.
1 20 Despite the regimented nature of military life, Mills's location at the time of the interview is easily distinguishable from the station house involved in Miranda. Our own supreme court has further stated that even "a person who is incarcerated is not always 'in custody' within the meaning of Miranda " and that Miranda custody "is a term of art that specifies cireumstances that are thought generally to present a serious danger of coer-clon." Butt,
{21 The second factor is whether the investigation was focused on the accused at the time of the questioning, if that fact was communicated to the accused. See State v. Maestas,
122 The third factor involves the presence or absence of "objective indicia of arrest." See Maestas,
$23 The fourth and final factor for determining custody is the length and form of the questioning. Mills concedes that the phone interview was quite short in duration, lasting approximately ten minutes. See id. ¶ 55 (stating that fifteen minutes was "a brief period of time as police interrogation goes"). He focuses instead on the nature of Butter-field's questions, which he characterizes as accusatory. See generally Mirquet,
1 24 Of the four factors, only one-the fact that Butterfield was focusing on Mills as a suspect-favors a finding of custody. In light of the other factors, we conclude that Mills's "freedom of action [was not] curtailed to a degree associated with formal arrest." State v. Levin,
125 Mills also argues that he had a Sixth Amendment right to the assistance of counsel during the phone interview even if he was not in custody for Miranda purposes. Mills argues that his Sixth Amendment right to counsel attached when the State initiated adversarial proceedings against him prior to the interview.
5
See generally State v. Wood,
126 We do not consider Mills's Sixth Amendment argument because he did not preserve it before the district court. See State v. Holgate,
II. Expert Witnesses
127 Mills argues that the State deprived him of his due process rights and his right to produce exculpatory evidence when it failed to provide him with two expert witness reports thirty days before trial. According to Mills, this failure entitled him to yet another continuance of his trial. Mills relies on Utah Code section 77-17-18(1)(a), which states, "If the prosecution or the defense intends to call any expert to testify in a felony case at trial ..., the party intending to call the expert
128 We initially note that Mills waived this issue by failing to raise it at the January 19, 2010 continuance hearing. Cf. State v. Perez,
129 Even if we were to reach the merits of Mills's argument, Mills relies solely on an alleged violation of Utah Code section Ti-17-18's requirement that the State disclose expert witness reports thirty days prior to trial if it "intends to call any expert to testify in a felony case at trial." See Utah Code Ann. § 77-17-18(1)(a), (b)@). We see no violation of this requirement where the State gave Mills notice more that thirty days prior to the ultimate trial date that it no longer intended to call the expert witnesses. Further, even if the statute did impose a duty on the part of the State to disclose the reports, the statutory remedy is "a continuance of the trial or hearing sufficient to allow preparation to meet the testimony," "if nee-essary to prevent substantial prejudice." Id. § 77-17-13(4)(a). As the State never did call the expert witnesses at trial, there was no need for a continuance "to allow preparation to meet the testimony" because there was ultimately no testimony for which to prepare. See id. Mills has also presented no argument as to how he suffered substantial prejudice by receiving the reports twenty-seven days before trial rather than thirty, particularly when the substance of the reports was that no evidence had been found on his computer.
130 In sum, Mills waived this issue when he failed to object to the February 15 trial date and when his counsel expressly indicated on the first day of trial that the trial could proceed despite any late disclosure of the experts' reports. Further, in light of the State's disclosure of the reports twenty-seven days before trial despite its lack of intent to call the expert witnesses, the absence of in-culpatory evidence in the reports, and the fact that the expert witnesses did not testify at Mills's trial, we see no violation of Utah Code section 77-17-18 in this matter. Accordingly, we will not disturb Mills's convie-tions on that basis.
IIL Jurisdiction
131 Mills argues that the State lacked criminal jurisdiction to convict him of three of the five counts of sexual exploitation of a minor. According to Mills, the State's theory that he violated Utah law by possessing pornographic images of C.D. required evidence that he possessed each of the five images within the state of Utah. On appeal,
$32 Criminal jurisdiction is governed by Utah Code section 76-1-201. See Utah Code Ann. § 76-1-201 (2008). Among other cireumstances enumerated in that statute, Utah has criminal jurisdiction over an offense when "the offense is committed either wholly or partly within the state." Id. § 76-1-201(1)(a). "An offense is committed partly within this state if either the conduct which is any element of the offense, or the result which is an element, occurs within this state." Id. § 76-1-201(2). "The jurisdiction determination is a matter for the trial court, not the jury, and the court itself must resolve any associated factual disputes by a preponderance of the evidence." State v. Holm,
133 Utah Code section 76-1-201 provides that "[a) defendant may challenge jurisdiction by filing a motion before trial stating which facts exist that deprive the state of jurisdiction." Utah Code Ann. § 76-1-201(5)(b). The Utah Supreme Court has suggested that this language "require[s] the defendant to file a pretrial motion in order to challenge jurisdiction." Holm,
134 Despite Mills's failure to file a pretrial motion, he did file a motion to dismiss near the close of the State's case that at least implicated jurisdiction, and the district court considered and ruled on that motion. We recognize that there may be situations where a jurisdictional deficiency might only become apparent once testimony and evidence is presented at trial. Further, the statutory language notwithstanding, "[cJrimi-nal jurisdiction is a form of subject matter jurisdiction" and "an appellate court may dismiss a criminal charge for lack of eriminal jurisdiction at any time, regardless of whether the defendant raised the issue before or during trial." Holm,
135 On the morning of the second day of trial, Mills's counsel made a motion to dismiss the sexual exploitation of a minor counts, arguing, "[TJhey have presented no evidence that he actually possessed [the images] here in the state of Utah. And [C.D.'s] testimony was she sent them all to him while he was in Louisiana" The district court denied the motion, stating, "I believe there's enough evidence to go to-to the jury. [C.D.] said that she viewed the pictures that she erased on the computer in Duchesne County." Mills argues on appeal that C.D. actually testified that she only saw two nude images of herself on his computer.
Q. Okay. Did you ever see the pictures again that you had sent to him?
A. After I'd sent them to him?
Q. Yeah.
A. I deleted them off of his computer when he was here on leave, the time that he foreed me to have sex with him.
[[Image here]]
Q. Okay. And how did you find the pictures on there?
A. I just went snooping through his pictures folder and then there was a folder with my name on it and it had pictures of me clothed and pictures of me nude. I just deleted the whole folder.
Q. Okay. Did you see any of the pictures that you've described earlier today?
A. I saw two of them in the little thumbnails on the folder.
(Emphasis added.) Contrary to Mills's interpretation, C.D.'s testimony strikes us as somewhat ambiguous and contradictory on the question of how many nude images were actually on Mills's computer. C.D.'s testimony that she deleted "them"-the images she had sent Mills-implies that those images were on the computer; however, her testimony that she "saw two of them" could also give rise to an inference that the computer held only two of the pornographic pictures or that she remembered seeing at least two. 11
137 We see no reason to disturb Mills's convictions merely because there was somewhat conflicting testimony about the number of partially nude pictures that C.D. deleted from his computer. Despite C.D.'s arguably conflicting statements, the district court found that C.D. had testified that "she viewed the pictures that she erased on the computer in Duchesne County." To challenge this factual finding on appeal, Mills is required to marshal the evidence in support of the district court's ruling. See State v. Greenwood,
T38 Even if we were to ignore Mills's marshaling failings, he would have to meet the high burden of demonstrating that the district court's ruling was clearly erroneous. See State v. Hutchings,
{ 39 The district court found that C.D. had testified that she had deleted the nude images that she had sent to Mills-five of which she had identified and described at trial-from his computer in the state of Utah. This
IV. Sufficiency of the Evidence
T40 Finally, Mills argues that there was insufficient evidence to convict him of sexual exploitation of a minor because the State did not actually produce the pornographic pictures of C.D. that he was alleged to have possessed. Mills argues that the only evidence of the content of the pictures was C.D.'s testimony and that testimony alone is insufficient to prove that the pictures constituted child pornography. We will affirm a jury's verdict against a sufficiency of the evidence challenge "if upon reviewing the evidence and all inferences that can be reasonably drawn from it, [we conclude] that some evidence exists from which a reasonable jury could find that the elements of the crime had been proven beyond a reasonable doubt." State v. Hamilton,
§41 For purposes of Utah's sexual exploitation statute, child pornography includes any visual depiction, including a photograph, where "the production of the visual depiction involves the use of a minor engaging in sexually explicit conduct" or "the visual depiction is of a minor engaging in sexually explicit conduct." See Utah Code Ann. § 76-5a-2(1) (2008). "Sexually explicit conduct" includes "the visual depiction of nudity or partial nudity for the purpose of causing sexual arousal of any person." See id. § 76-ba-2(8)(f). And nudity or partial nudity is defined as "any state of dress or undress in which the human genitals, pubic region, buttocks, or the female breast, at a point below the top of the areola, is less than completely and opaquely covered." See id. § 76-52-2(6). The pictures of C.D., a minor, therefore constituted child pornography if the images or their production (1) depicted C.D.'s uncovered breasts and (2) did so for the purpose of causing sexual arousal to any person.
1 42 C.D.'s testimony is clearly sufficient to establish both of these elements, particularly since C.D. was personally familiar with both the contents of the pictures and the cireum-stances surrounding their production and transfer to Mills As to the presence of C.D.'s bare breasts in each of the five pictures, C.D. described each picture in detail as to where she was, what she was wearing, and how she was posed. C.D. confirmed that she took each picture of herself topless and that, in each picture, both of her breasts were completely exposed. A reasonable jury could certainly have accepted this direct testimony as proof beyond a reasonable doubt that the pictures each depicted C.D.'s bare breasts.
48 C.D.'s testimony also supports a reasonable inference that her nudity in the pictures was "for the purpose of causing sexual arousal of any person." See id. § T6-5a-2(8)(f); see also State v. Garcia-Vargas,
[ 44 In light of C.D.'s testimony, we see no evidentiary problem with the jury's conclusion that the five pictures constituted child pornography. C.D. described each image in detail and confirmed that each displayed her bare breasts. But perhaps more importantly, C.D. described the sexualized context in which the pictures were requested, taken, and sent to Mills Under these circumstances, we readily conclude that "some evidence exists from which a reasonable jury could find that the elements of the crime had been proven beyond a reasonable doubt." Hamilton,
CONCLUSION
T 45 The district court did not err in denying Mills's motion to suppress because Mills was not in custody at the time of his phone interview and was therefore not entitled to Miranda warnings. We do not address Mills's argument that the interview violated his Sixth Amendment right to counsel because he did not preserve that issue in the district court. The district court also acted within its discretion in its rulings related to expert witnesses. Finally, the State had criminal jurisdiction over all five of Mills's sexual exploitation of a minor convictions, and C.D.'s testimony describing the nude images and their context adequately supports those convictions. For these reasons, we affirm Mills's convictions.
146 WE CONCUR: J. FREDERIC VO-ROS JR., Judge, and STEPHEN L. ROTH, Judge.
Notes
. We recite the facts in the light most favorable to the jury's verdict. See State v. Jeffs,
. "Sexual exploitation of a minor" is Utah's name for the crime committed by, inter alia, possessing or producing child pornography. See Utah Code Ann. § 76-5a-3 (2008) (current version at id. § 76-5b-201 (2012)).
. The district court's denial of Mills's suppression motion apparently occurred at a motion hearing. The transcript of that hearing is not a part of the record on appeal, and there is no minute entry for the hearing. Nevertheless, it is undisputed that the district court denied Mills's motion.
. Mills also argues that Butterfield's statement that C.D. had accused him of rape constituted an objective indication that Mills was under arrest. We address the form of Butterfield's questioning under the fourth custody factor. See State v. Maestas,
. The record indicates that the State charged Mills by information on April 29, the same day as his interview with Butterfield. The State argues that it is unclear from the record whether the phone call took place before or after the information was filed. Mills responds by asserting that the district court made a finding at the suppression hearing that the information was filed several hours prior to the phone call, although the transcript of that hearing is not in the record. For purposes of this analysis, we will simply assume that the interview occurred after Mills had been formally charged.
. During the phone interview, Butterfield did not inform Mills that the State had filed charges against him, and Mills did not invoke a right to counsel. Instead, Mills elected to speak with Butterfield without the assistance of counsel. If Mills's decision to proceed without counsel was "knowing and intelligent," then his actions likely effected a waiver of any Sixth Amendment right to counsel that may have arisen from the filing of charges. See generally Patterson v. Illinois,
. We note that Mills does not argue plain error or exceptional circumstances, and we therefore do not consider those exceptions to the preservation rule. See State v. Winfield,
. Mills's appellate brief makes a cursory reference to the district court's refusal to allow his counsel to withdraw his express waiver but raises no argument or authority that the district court's decision was in error. Mills also suggests that his waiver should be limited to issues governed by rule 16 of the Utah Rules of Criminal Procedure, but it is clear from the context that his waiver included the issue of the late-disclosed experts' reports even though that issue arises under Utah Code section 77-17-13 rather than rule 16.
. In the information against Mills, each sexual exploitation of a minor count alleged that he ''knowingly produced, distributed, possessed, or possessed with intent to distribute child pornography," and did so in "Duchesne County, State of Utah." Clearly, this language alleges violations of Utah law occurring within the state of Utah. We note that the State eventually limited its prosecution of these counts to a possession theory and that the jury was instructed to convict Mills only if it found that he had possessed child pornography in Utah.
. Although we consider Mills's argument, we note that a pretrial motion would have been very helpful in focusing the district court and the parties on the jurisdictional issues in this case. We also note that these issues were eminently foreseeable in light of the interstate circumstances surrounding C.D.'s allegations and the charges against Mills.
. We note that C.D.'s testimony that she deleted all five pictures is not necessarily fatally inconsistent with her testimony that she saw two of the pictures on Mills's computer. One explanation for her testimony might be that C.D. only saw two of the nude images on Mills's computer but recognized the others from their file names or dates without viewing the images themselves. We also note that the relevant factual issue is whether the images were on Mills's computer, not whether C.D. viewed them.
. We note that Mills does not challenge the sufficiency of the evidence supporting the jury's findings that he possessed each image in Utah.
