SAUFLEY, C.J.
[¶ 1] In this appeal, we consider whether a person’s pre-arrest silence may be offered as evidence of consciousness of guilt in a criminal prosecution without offending the Fifth Amendment of the United States Constitution and article I, section 6 of the Maine Constitution. We also consider allegations of prosecutorial misconduct. Because we conclude that a defendant’s silence following the explicit assertion of the right to consult with counsel cannot be used as evidence of consciousness of guilt and because the prosecutor improperly opined on witness credibility, we vacate the judgments of conviction entered in this case.
[¶ 2] Jason M. Lovejoy appeals from judgments of conviction of two counts of gross sexual assault (Class A), 17-A M.R.S.A. § 253(1)(B), (4) (Supp.2000),
entered by the court
(Warren, J.)
after a jury trial. In addition to the issues that we address in this opinion, Lovejoy challenges the sufficiency of the evidence to convict him of the crimes, argues that there were other instances of prosecutorial misconduct, and challenges the court’s determination of his sentence. Without further discussion, we conclude that the other challenged prosecutorial conduct did not undermine the fairness of the proceedings and that, in light of the alleged victim’s testimony, Lovejoy’s challenge to the sufficiency of the evidence fails. We do not consider the sentencing issues in this appeal because we vacate the judgments of conviction based on the violation of Love-joy’s constitutional right to remain silent and the prosecutorial statements in closing arguments that deprived him of a fair trial.
I. BACKGROUND
[¶ 3] In the fall of 2010, at the age of fifteen, Lovejoy’s daughter told her best friend that her father had sexually assaulted her beginning when she was about five years old. She later informed her mother, and ultimately the Portland Police Department began an investigation. A Portland police detective had one or two telephone conversations with Lovejoy. Lovejoy, who was living in North Carolina at the time, denied the allegations and said that he wanted to talk to a lawyer. He did not return subsequent telephone calls from the police.
[¶4] In the fall of 2011, Lovejoy was arrested and charged by indictment with two counts of gross sexual assault (Class A), 17-A M.R.S.A. § 25S(1)(B), for conduct occurring between October 1, 2000, and January 1, 2003. After a February 2012 trial resulted in a mistrial, the court held a two-day jury trial the following month. The State called several witnesses, including, among others, Lovejoy’s daughter (the alleged victim), the Mend in whom she confided, the alleged victim’s mother, the investigating Portland police detective, and a nurse practitioner at the Spurwink Child Abuse Program. Lovejoy presented testimony from his acquaintances and from his current wife. He did not testify.
[¶ 5] Lovejoy’s daughter, who was sixteen years old at the time of the trial, testified that, when she was between the ages of about five and eight, Lovejoy would have her sit on his lap while he showed her pornographic pictures and videos on a computer in his bedroom. She testified that he touched her vagina with his fingers and, on multiple occasions, penetrated her vagina and anus with his penis. She also testified about how she disclosed that he had assaulted her. The nurse practitioner who physically examined Lo-vejoy’s daughter as a teenager testified that she did not find any physical evidence of sexual assault. She also testified, however, that the absence of physical evidence did not rule out the possibility that the alleged assaults had, in fact, occurred.
[¶ 6] During direct examination of the police detective, the prosecutor questioned the detective about his attempts to contact Lovejoy before Lovejoy’s return to Maine and subsequent arrest. The detective testified that he had one or two telephone conversations with Lovejoy and that he informed Lovejoy of the allegations of sexual assault. When the prosecutor asked how Lovejoy had responded to this information, defense counsel requested a sidebar conference. Counsel asked that the witness be instructed not to mention that Lovejoy “told him he wanted to talk to a lawyer,” but counsel did not explicitly seek to prevent testimony regarding Lovejoy’s refusal to speak with the detective. Thus, the detective was told only to avoid referencing Lovejoy’s request for counsel.
[¶ 7] After the sidebar conference, the prosecutor asked the detective to describe to the jury Lovejoy’s reaction during the phone conversation. The detective testified that Lovejoy denied the allegations of abuse with a “kind of flat affect” and “no emotion.”
The detective then testified that, after this initial conversation, he attempted to contact Lovejoy at least two more times. The prosecutor asked the detective whether he had received any return calls, and the detective responded that he had not. The prosecutor asked, “Was this odd or unusual in your mind?”
The court sustained Lovejoy’s objection to this question.
[¶ 8]' During her closing argument, the prosecutor commented on Lovejoy’s silence in response to police phone calls. She asked the jury to “[cjonsider what we call the defendant’s consciousness of guilt,” and referenced the fact that, despite the detective’s phone calls and messages, Lo-vejoy “never kept in contact” and “never chose to call” or come “up to Maine to clear up the charges in person.”
[¶ 9] The prosecutor also stated, “I would argue to you that [the victim] was an entirely credible witness” and further argued, “I would like you to consider the testimony of all of the witnesses, the State’s and the defendant’s. All were consistent in their testimony.
They were all credible.”
(Emphasis added.)
[¶ 10] After the prosecutor concluded her closing argument, Lovejoy requested a sidebar conference and moved for mistrial because of the statements concerning the victim’s credibility. The court agreed that the prosecutor had improperly expressed an opinion supporting the victim’s credibility but denied the motion for a mistrial, indicating that it would provide a curative instruction at the end of closing arguments.
[¶ 11] After defense counsel argued, “[t]his case is going to hinge on whether or not you believe [the victim],” the prosecutor, in her rebuttal argument, again asserted the victim’s credibility. Specifically, she argued that the victim’s testimony that she told Lovejoy to stop sexually abusing her at a certain age was “entirely credible.”
[¶ 12] The court provided instructions to the jury, including the following:
In particular, let me remind you that the opening statements and the closing arguments of the attorneys are not evidence .... [T]o the extent you are hearing arguments from the attorneys that include their personal opinions, you should disregard that entirely.... [Y]ou should remember that it’s not the attorney’s opinion, it is your own evaluation of the evidence that ... you need to make. You have to make your own decisions as to credibility....
The court also instructed the jury not to consider Lovejoy’s exercise of the right not to testify as evidence of his guilt. The jury returned a verdict finding Lovejoy guilty of both counts of gross sexual assault.
[¶ 13] The court held a sentencing hearing on August 10 and 24, 2012, and on August 24, 2012, the court imposed the sentence. After determining a basic sentence of fifteen years,
see
17-A M.R.S. § 1252-C(1) (2013), the court, applying 17-A M.R.S. § 1252-C(2) (2013), determined a maximum period of imprisonment of twenty years, relying, in part, on the aggravating factor of certain uncharged conduct by the defendant concerning abuse of his younger daughter and his half-sister. The court imposed a final sentence of twenty years with sixteen years unsuspended “in light of the seriousness” and “gravity of the offense.”
See
17-A M.R.S. § 1252-C(3) (2013).
[¶ 14] Concerning the appropriate term of probation, the court, applying 17-A M.R.S.A. § 1202(1-A) (Supp.2000)
and
17-A M.R.S.A. § 257 (Supp.2000),
extended the term of Lovejoy’s probation from six years to ten years “based on a finding that his victim was prepubescent.” The court rejected Lovejoy’s argument that, pursuant to
Apprendi v. New Jersey,
530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000), and its progeny, the court could not extend the term of his probation in the absence of a jury finding that the victim was prepubescent when the assaults occurred.
[¶ 15] Pursuant to 15 M.R.S. § 2115 (2013) and M.R.App. P. 2(b)(2)(A), Lovejoy timely appealed from the judgments of conviction. After the Sentence Review Panel granted Lovejoy’s request for leave to appeal,
see
15 M.R.S. § 2151 (2013); M.R.App. P. 20, we consolidated his sentence appeal with his appeal from the convictions. We do not, however, reach the contentions raised in his sentence appeal because we vacate the convictions.
II. DISCUSSION
[¶ 16] The two issues that determine the outcome of this appeal are (A) the admissibility of evidence concerning Love-joy’s silence when approached by the police before his arrest and (B) the effect of prosecutorial comments regarding witness credibility on the fairness of Lovejoy’s trial. We consider each issue separately.
A. Testimony Regarding Pre-Arrest Silence
[¶ 17] Lovejoy argues that the prosecutor violated the Fifth Amendment of the United States Constitution and article I, section 6 of the Maine Constitution by eliciting testimony that Lovejoy did not return phone calls from police and by ar
guing to the jury that his failure to explain what happened demonstrated consciousness of guilt. Lovejoy contends that he was deprived of a fair trial and that the prosecution improperly suggested that he had some obligation to negate the victim’s testimony.
[¶ 18] Pursuant to the United States Constitution, “No person ... shall be compelled in any criminal case to be a witness against himself....” U.S. Const, amend. V. The Maine Constitution contains a similar provision: “The accused shall not be compelled to furnish or give evidence against himself or herself....” Me. Const, art. I, § 6. We interpret the Maine Constitution to be coextensive with the United States Constitution in this context.
See, e.g., State v. Millay,
2001 ME 177, ¶¶ 14-20, 787 A.2d 129.
[¶ 19] Because Lovejoy did not explicitly object to the testimony and the prosecutor’s comments concerning his pre-arrest silence, the trial court did not address the application of the constitutions in this context, and we review for obvious error.
See
U.C.D.R.P.-Cumberland County 52(b); M.R.Crim. P. 52(b);
State v. Pabon,
2011 ME 100, ¶ 18, 28 A.3d 1147. For us to vacate a conviction based on the obvious error standard of review,
there must be (1) an error, (2) that is plain, and (3) that affects substantial rights. If these conditions are met, we will exercise our discretion to notice an unpreserved error only if we also conclude that (4) the error seriously affects the fairness and integrity or public reputation of judicial proceedings.
Pabon,
2011 ME 100, ¶ 29, 28 A.3d 1147. An error is plain if it is so clear under current law that the trial court can be expected to address it, even absent the defendant’s timely objection to it.
State v. Dolloff,
2012 ME 130, ¶ 36, 58 A.3d 1032. An error affects the defendant’s substantial rights “if the error was sufficiently prejudicial to have affected the outcome of the proceeding.”
Id.
¶ 37 (quotation marks omitted).
[¶ 20] Measures that protect the Fifth Amendment right to remain silent exist in multiple contexts and, in most contexts, include a prohibition against the prosecution’s reliance on that silence as evidence of guilt.
For example, there can be no question that the Fifth Amendment “prevents the prosecution or the court from commenting on a defendant’s decision not to testify at his criminal trial.”
State v. Patton,
2012 ME 101, ¶ 15, 50 A.3d 544 (citing
Griffin v. California,
380 U.S. 609, 615, 85 S.Ct. 1229, 14 L.Ed.2d 106 (1965)). Similarly, a defendant’s post-arrest, in-custody, unambiguous assertion of a decision not to speak to law enforcement must be scrupulously honored and cannot be used against the defendant at trial.
See Doyle v. Ohio,
426 U.S. 610, 617-19, 96 S.Ct. 2240, 49 L.Ed.2d 91 (1976);
Miranda v. Arizona,
384 U.S. 436, 467-79, 86 S.Ct. 1602, 16 L.Ed.2d 694 (1966);
State v. Grant,
2008 ME 14, ¶¶ 20, 38, 939 A.2d 93.
[¶ 21] Whether those same Fifth Amendment protections “extend to prevent the introduction in evidence of a defendant’s pre-arrest,
pre-Miranda
silence in the State’s case-in-chief,”
Patton,
2012
ME 101, ¶ 15, 50 A.3d 544, has not yet been decided by the United States Supreme Court,
see Salinas v. Texas,
570 U.S. -, 133 S.Ct. 2174, 186 L.Ed.2d 376 (2013).
The federal circuits are divided on the question of whether the Fifth Amendment prevents the prosecution from using a defendant’s noncustodial, pre-ar-rest silence in its case-in-chief.
Compare Combs v. Coyle,
205 F.3d 269, 283 (6th Cir.2000) (holding that evidence of pre-arrest silence may not be admitted in a criminal trial as evidence of the defendant’s guilt);
United States v. Burson,
952 F.2d 1196, 1200-01 (10th Cir.1991) (same),
with United States v. Oplinger,
150 F.3d 1061, 1066-67 (9th Cir.1998) (holding that a defendant’s pre-arrest,
pre-Miranda
silence may be used as substantive evidence of guilt),
overruled in part on other grounds by United States v. Contreras,
593 F.3d 1135 (9th Cir.2010);
United States v. Zanabria,
74 F.3d 590, 593 (5th Cir.1996) (same).
[1122] On this question, we have concluded that individuals are endowed with the Fifth Amendment’s protections against compelled self-incrimination both before and after arrest.
See State v. Diaz,
681 A.2d 466, 468 (Me.1996). We reached this holding in a case in which the defendant’s pre-arrest, noncustodial statement refusing to answer a state trooper’s question was admitted in evidence, and the prosecution referred to the defendant’s refusal to speak in its closing and rebuttal argument.
Id.
at 468-69. We held that the Fifth Amendment “right to remain silent, unlike the right to counsel, attaches
before
the institution of formal adversary proceedings” and that the Constitution “clearly requires the exclusion of evidence of the defendant’s failure to answer [the state trooper’s] question.”
Id.
(quotation marks omitted).
[¶ 23] In another recent case, the State offered evidence in its case-in-ehief that a suspect stated, before arrest and without having received
Miranda
warnings, that he needed to speak with counsel and, after making that statement, remained silent.
Patton,
2012 ME 101, ¶¶ 12, 15-16, 50 A.3d 544. The State conceded error, and we reviewed the error to determine whether it was harmless.
Id.
¶ 16. In that review, we concluded that the error was harmless because the evidence presented at trial was strong and “the State did not seek to capitalize on ... testimony” that the defendant told police he needed to talk to his lawyer.
Id.
¶ 18. Apart from the admitted testimony, the State did not refer to the defendant’s expressed desire to speak with his attorney in any other way, “either through its questioning of witnesses or in closing argument.”
Id.
“[I]t was never suggested to the jury that [the defendant’s] statement to the officer should be
viewed as evidence of his guilt.”
Id.
We explicitly distinguished
Diaz,
noting that in that case, “the State encouraged the jury to infer guilt from the defendant’s silence because the State referred to the defendant’s failure to answer an officer’s questions
both in its dosing argument and in rebuttal.” Id.
¶ 18 n. 2 (emphasis added).
[¶ 24] We distinguish the factual context before us from that which arises when, as in
Salinas,
570 U.S. -, 133 S.Ct. 2174, 186 L.Ed.2d 376, a defendant is voluntarily speaking with law enforcement officers and then simply ceases speaking without any clear indication of an intention to exercise the right not to be a witness against himself.
See id.
at -, 133 S.Ct. at 2178-84, 186 L.Ed.2d at 383-89 (plurality opinion) (reasoning that an express invocation of the right to remain silent is necessary in such circumstances). In contrast to those facts, Lovejoy specifically terminated communication by first telling the investigating detective during a telephone conversation that he wanted to speak with a lawyer and then remaining silent by not returning the detective’s telephone calls.
See Patton,
2012 ME 101, ¶ 15, 50 A.3d 544.
[¶ 25] Although Lovejoy did not explicitly state that he was also exercising his right against compelled self-incrimination, we have never required the use of any specific words for a person to enjoy constitutional protection for his or her silence.
See id.; see also, e.g., Diaz,
681 A.2d at 467-69 (holding that the defendant exercised the Fifth Amendment right against self-incrimination when he said that he did not think he should answer a police officer’s questions). “[N]o ritualistic formula is necessary in order to invoke the privilege.”
Quinn v. United States,
349 U.S. 155, 164, 75 S.Ct. 668, 99 L.Ed. 964 (1955). We do, however, require that the record demonstrate the defendant’s intention to exercise the constitutional right against compelled self-incrimination.
See Diaz,
681 A.2d at 467-69. Thus, in many contexts, a defendant is not deemed to have exercised the constitutionally protected right against compelled self-incrimination by virtue of silence alone.
See Salinas,
570 U.S. at -, 133 S.Ct. at 2181-82, 186 L.Ed.2d at 386 (plurality opinion) (“A witness does not expressly invoke the privilege by standing mute.”).
[¶ 26] To determine whether a defendant did express the intention to exercise this Fifth Amendment right, a court must consider the specific circumstances in
which a defendant was questioned and the defendant’s response to that questioning. Here, Lovejoy terminated a telephone conversation with the investigating detective upon stating that he wanted to speak with a lawyer
and then did not return the detective’s subsequent telephone calls. These facts provide sufficient information to demonstrate Lovejoy’s invocation of his right against self-incrimination for purposes of the Fifth Amendment and article I, section 6 of the Maine Constitution.
See United States v. Okatan,
728 F.3d 111, 115, 119 (2d Cir.2013) (holding, after
Salinas
was decided, that a request for a lawyer in response to noncustodial questioning constitutes an invocation of the privilege against self-incrimination);
Patton,
2012 ME 101, ¶ 15, 50 A.3d 544 (holding, before
Salinas
was decided, that a noncustodial request to speak with counsel, before
Miranda
warnings were given, constituted an assertion of the Fifth Amendment right against compelled self-incrimination).
[¶ 27] Although, by agreement, the prosecutor avoided eliciting testimony about Lovejoy’s statement that he wanted to speak with an attorney, she did elicit testimony that Lovejoy did not return the detective’s calls. She also argued in her closing argument that this silence evidenced consciousness of . guilt. Because the prosecutor, as in
Diaz,
sought to capitalize on the improperly admitted testimony of Lovejoy’s failure to respond to the police detective by arguing that it demonstrated Lovejoy’s consciousness of guilt, the testimony and argument constituted a violation of the Fifth Amendment and article I, section 6 of the Maine Constitution.
See Patton,
2012 ME 101, ¶ 18 n. 2, 50 A.3d 544;
Diaz,
681 A.2d at 468-69;
see also State v. Glover,
2014 ME 49, ¶ 11, 89 A.3d 1077, 2014 WL 1257088 (noting that the “probative value of a defendant’s exercise of a constitutional right is minimal at best”).
[¶ 28] In reviewing the admission of the testimony in the context of this trial for obvious error,
see Pabon,
2011 ME 100, ¶ 18, 28 A.3d 1147, we conclude that there is “(1) an error, (2) that is plain,”
id.
¶ 29, given our holding in
Diaz,
681 A.2d at 468-69.
See also Dolloff,
2012 ME 130, ¶ 36, 58 A.3d 1032. We further conclude that the error (3) “affects substantial rights,”
Pabon,
2011 ME 100, ¶ 29, 28 A.3d 1147, because the evidence not only was offered at trial but also was emphasized in closing arguments in a case in which there was no physical evidence linking Lovejoy to the crime and the verdict turned entirely on the credibility of the witnesses. In such circumstances, the error was sufficiently prejudicial that it could have affected the outcome of the proceeding.
Cf. Dolloff,
2012 ME 130, ¶ 53, 58 A.3d 1032.
[¶ 29] Finally, because of the improperly admitted evidence and the subsequent argument that Lovejoy declined to speak with police, we conclude that “(4) the error seriously affects the fairness and integrity or public reputation of judicial proceedings.”
Pabon,
2011 ME 100, ¶ 29, 28 A.3d 1147;
see also id.
¶ 27 (explaining that if a defendant claims a constitutional error, the appellate discretion afforded by the fourth criterion of obvious error re-
view — whether the error seriously affects the fairness and integrity or public reputation of judicial proceedings — “is considerably reduced”). We reach this conclusion because the prosecutor argued to the jury that Lovejoy’s silence should be considered as substantive evidence of his guilt, and although the court instructed that the jury should not hold against Lovejoy his decision not to testify, it made no similar instruction regarding his pre-arrest silence.
See Diaz,
681 A.2d at 469. We cannot affirm a conviction that so evidently depended on the jury’s determinations of credibility when the prosecution offered evidence and argument that the defendant’s decision not to speak to the police constituted evidence of his guilt.
B. Prosecutorial Misconduct
[¶ 30] Lovejoy argues that the prosecutor committed misconduct by stating that the witnesses were credible and by further commenting on the alleged victim’s credibility even after the court determined that such statements were impermissible.
[¶ 31] “When an objection has been made to a prosecutor’s statements at trial, we review to determine whether there was actual misconduct and, if so, whether the trial court’s response remedied any prejudice resulting from the misconduct.”
Dolloff,
2012 ME 130, ¶ 32, 58 A.3d 1032 (citations omitted). Because Lovejoy objected to the prosecutor’s statements concerning witnesses’ credibility during closing argument, we review for harmless error.
See
U.C.D.R.P.-Cumberland County 52(a); M.R.Crim. P. 52(a).
[¶ 32] A prosecutor may not use “the authority or prestige of the prosecutor’s office to shore up the credibility of a witness, sometimes called ‘vouching.’ ”
Dolloff,
2012 ME 130, ¶ 42, 58 A.3d 1032 (citing
State v. Williams,
2012 ME 63, ¶ 46, 52 A.3d 911). In response to Love-joy’s objection, the court told counsel that, after the closing arguments, the court would issue a curative instruction to the jury making clear that the jury should disregard the attorneys’ expressed opinions about the credibility of witnesses. Unfortunately, the prosecutor again commented that the victim’s testimony was credible during the rebuttal argument. Such repeated vouching for witness credibility, even after being warned not to, when considered in combination with references to Lovejoy’s pre-arrest silence, cannot be regarded as harmless error.
III. CONCLUSION
[¶ 33] Because Lovejoy’s pre-arrest silence was used against him as evidence of consciousness of guilt in violation of the United States and Maine Constitutions, and because the prosecutor improperly vouched for the credibility of the witnesses, Lovejoy did not receive a fair trial. The two identified defects in Lovejoy’s trial require us to vacate his convictions and remand this matter to the trial court for further proceedings. Accordingly, the issues raised in Lovejoy’s sentence appeal are moot, and we do not discuss them further.
See State v. York,
1999 ME 100, ¶ 5, 732 A.2d 859 (stating that “we decline to decide issues which by virtue of valid and recognizable supervening circumstances have lost their controversial vitality” (quotation marks omitted)).
The entry is:
Judgments of conviction vacated. Remanded for further proceedings consistent with this opinion.