OPINION
MATTHEWS, Chief Justice.
I. INTRODUCTION
The superior court dismissed Timothy Beavers’s robbery indictment on the ground that his confession was involuntary. The court of appeals reinstated the indictment, finding the confession voluntary under the “totality of the circumstances.” Beavers argues that his confession was presumptively involuntary because it was partially induced by a police officer’s threat of harsher treatment. Because we agree with Beavers, we reverse the court of appeals decision and vacate Beavers’s indictment.
II. FACTS AND PROCEEDINGS
A. Facts
The facts of this case are uncontested. On November 1, 1995, Alaska State Troopers Gerald Graham and David Tullís questioned Beavers, then sixteen years old, during their investigation of two Anchorage robberies. At approximately 2:00 p.m. the troopers arrived at the restaurant where Beavers worked. They identified themselves and informed Beavers of their desire to question him outside the restaurant in order to avoid the noise inside. At Graham’s invitation, Beavers entered the troopers’ vehicle and sat in the passenger’s seat; Graham and Tullis occupied the driver’s and rear seats, respectively. The interview that followed lasted twenty-one minutes.
[1042]*1042■ Graham asked Beavers his age, and Beavers responded that he was sixteen. The troopers then informed Beavers that he was not under arrest, had not been charged with any crime,, and remained free to terminate the interview and exit the vehicle at any time. However, Graham emphasized to Beavers the importance of Beavers’s cooperation: “But, I do need to talk’to you, it’s real important. I think you know what it’s about. And, I think you need to talk with me about it. Okay?”
Graham explained that he had recently interviewed several of Beavers’s friends who were also implicated in the robberies under investigation and that the troopers now desired to obtain Beavers’s “side of the story.” The discussion shifted toward various burglaries committed by one of Beavers’s friends. Beavers answered a few questions indicating his knowledge of his friend’s involvement in the crime.s. Graham then reiterated his earlier admonition concerning the importance of Beavers’s cooperation in the interview:
And I want to make sure that uhm, I mean, if you’re involved in the burglaries, you need to tell me. If you’re not, that’s fine, but if I later come back and find out that you are involved there’s going to be some problems here, you understand? Okay. I want to get this cleared up now.
He also repeated his previous assurance that Beavers was not under arrest and could leave at will. Graham then directly questioned Beavers about his involvement in the burglaries. Beavers denied any participation.
Following Beavers’s initial denial, Graham asked him several questions concerning his friends and the location of various stolen items. After Beavers had answered the questions to the .troopers’ satisfaction, Graham spoke the words that form the basis of Beavers’s present appeal:
Okay. Well I know you’re telling the truth because it’s the same stuff we’ve already been told. I, but I have to confirm it. I mean, there’s stuff I know and stuff I don’t know. That’s how I we do an interview. And, if you’re telling me the truth,.you’ll be telling me stuff that I already know and I’ll know that you’re telling me the truth. This is important, okay? It, it’s very important. I know that when you’re young, you do some stupid stuff, make a, make a wrong turn somewhere, okay. And, and you do some crazy stuff, okay? But, if you’re, if you try and hide it from me you’re really going to get hammered. I mean it’s, you gotta come out and tell me the truth on this stuff, okay? I know some stuff that you’re into and we’re going to have to talk about that, okay?
(Emphasis added.)
Beavers responded affirmatively. Graham then asked Beavers if he understood. Beavers replied “[n]ot really. Like what kind of stuff?” Graham indicated his desire to discuss one of the robberies under investigation and showed Beavers a lineup containing photographs of Beavers and one of the other youths implicated in the robbery. Graham asked Beavers to identify himself and the other youth in the photograph, and Beavers complied.
Graham then asked Beavers if he understood what the lineup photographs were used for. Beavers gave a brief, inaudible answer, after which Graham responded:
That’s right. You walk up to a victim and you say, “See anybody in here you recognize?” and they go (smack) “I recognize this person, 'this person was there. This person was one of the guys that robbed me.” Now if you want to lie to me and get in more trouble, that’s fine, okay? That’s your decision. This is the only chance I can help you. You’re young, you need to get this cleaned up now, okay? You want to tell me the truth?
Beavers immediately admitted his participation in the robbery. Responding to Graham’s request that he describe the incident “in [his] own words,” Beavers provided a detailed account of the robbery and explained how the youths had disposed of the stolen property. When Graham subsequently inquired about the other robbery under investigation, Beavers likewise admitted his involvement and described that incident for the troopers.
Graham acknowledged Beavers’s forthrightness during the interview. He asked [1043]*1043Beavers to submit a palm print and to assist the troopers in retrieving the stolen property. Graham repeatedly informed Beavers that his cooperation in these matters was voluntary, providing Beavers with the opportunity to refuse. Beavers indicated his willingness to assist the troopers in retrieving the stolen property, but expressed reluctance at submitting a palm print. Graham responded by suggesting that the officers would obtain a search warrant if Beavers refused, and also informed Beavers that he might ultimately be arrested notwithstanding his cooperation. Beavers eventually acquiesced, was taken to the troopers’ station for a palm print to be taken, and was later returned to his mother’s residence by the troopers.
B. Proceedings
In presenting its case to the grand jury, the prosecution relied in part upon Beavers’s confession to Trooper Graham. The grand jury returned an indictment for first-degree robbery against Beavers.
Beavers moved to suppress his confession in superior court, alleging that it had been involuntarily given and obtained in violation of his Miranda, rights.1 The state opposed Beavers’s motion. After an evidentiary hearing, the superior court ruled that the troopers had not violated Beavers’s Miranda rights because Beavers was not in custody during the interview.
However, the superior court also found that Beavers’s confession had been involuntary.
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OPINION
MATTHEWS, Chief Justice.
I. INTRODUCTION
The superior court dismissed Timothy Beavers’s robbery indictment on the ground that his confession was involuntary. The court of appeals reinstated the indictment, finding the confession voluntary under the “totality of the circumstances.” Beavers argues that his confession was presumptively involuntary because it was partially induced by a police officer’s threat of harsher treatment. Because we agree with Beavers, we reverse the court of appeals decision and vacate Beavers’s indictment.
II. FACTS AND PROCEEDINGS
A. Facts
The facts of this case are uncontested. On November 1, 1995, Alaska State Troopers Gerald Graham and David Tullís questioned Beavers, then sixteen years old, during their investigation of two Anchorage robberies. At approximately 2:00 p.m. the troopers arrived at the restaurant where Beavers worked. They identified themselves and informed Beavers of their desire to question him outside the restaurant in order to avoid the noise inside. At Graham’s invitation, Beavers entered the troopers’ vehicle and sat in the passenger’s seat; Graham and Tullis occupied the driver’s and rear seats, respectively. The interview that followed lasted twenty-one minutes.
[1042]*1042■ Graham asked Beavers his age, and Beavers responded that he was sixteen. The troopers then informed Beavers that he was not under arrest, had not been charged with any crime,, and remained free to terminate the interview and exit the vehicle at any time. However, Graham emphasized to Beavers the importance of Beavers’s cooperation: “But, I do need to talk’to you, it’s real important. I think you know what it’s about. And, I think you need to talk with me about it. Okay?”
Graham explained that he had recently interviewed several of Beavers’s friends who were also implicated in the robberies under investigation and that the troopers now desired to obtain Beavers’s “side of the story.” The discussion shifted toward various burglaries committed by one of Beavers’s friends. Beavers answered a few questions indicating his knowledge of his friend’s involvement in the crime.s. Graham then reiterated his earlier admonition concerning the importance of Beavers’s cooperation in the interview:
And I want to make sure that uhm, I mean, if you’re involved in the burglaries, you need to tell me. If you’re not, that’s fine, but if I later come back and find out that you are involved there’s going to be some problems here, you understand? Okay. I want to get this cleared up now.
He also repeated his previous assurance that Beavers was not under arrest and could leave at will. Graham then directly questioned Beavers about his involvement in the burglaries. Beavers denied any participation.
Following Beavers’s initial denial, Graham asked him several questions concerning his friends and the location of various stolen items. After Beavers had answered the questions to the .troopers’ satisfaction, Graham spoke the words that form the basis of Beavers’s present appeal:
Okay. Well I know you’re telling the truth because it’s the same stuff we’ve already been told. I, but I have to confirm it. I mean, there’s stuff I know and stuff I don’t know. That’s how I we do an interview. And, if you’re telling me the truth,.you’ll be telling me stuff that I already know and I’ll know that you’re telling me the truth. This is important, okay? It, it’s very important. I know that when you’re young, you do some stupid stuff, make a, make a wrong turn somewhere, okay. And, and you do some crazy stuff, okay? But, if you’re, if you try and hide it from me you’re really going to get hammered. I mean it’s, you gotta come out and tell me the truth on this stuff, okay? I know some stuff that you’re into and we’re going to have to talk about that, okay?
(Emphasis added.)
Beavers responded affirmatively. Graham then asked Beavers if he understood. Beavers replied “[n]ot really. Like what kind of stuff?” Graham indicated his desire to discuss one of the robberies under investigation and showed Beavers a lineup containing photographs of Beavers and one of the other youths implicated in the robbery. Graham asked Beavers to identify himself and the other youth in the photograph, and Beavers complied.
Graham then asked Beavers if he understood what the lineup photographs were used for. Beavers gave a brief, inaudible answer, after which Graham responded:
That’s right. You walk up to a victim and you say, “See anybody in here you recognize?” and they go (smack) “I recognize this person, 'this person was there. This person was one of the guys that robbed me.” Now if you want to lie to me and get in more trouble, that’s fine, okay? That’s your decision. This is the only chance I can help you. You’re young, you need to get this cleaned up now, okay? You want to tell me the truth?
Beavers immediately admitted his participation in the robbery. Responding to Graham’s request that he describe the incident “in [his] own words,” Beavers provided a detailed account of the robbery and explained how the youths had disposed of the stolen property. When Graham subsequently inquired about the other robbery under investigation, Beavers likewise admitted his involvement and described that incident for the troopers.
Graham acknowledged Beavers’s forthrightness during the interview. He asked [1043]*1043Beavers to submit a palm print and to assist the troopers in retrieving the stolen property. Graham repeatedly informed Beavers that his cooperation in these matters was voluntary, providing Beavers with the opportunity to refuse. Beavers indicated his willingness to assist the troopers in retrieving the stolen property, but expressed reluctance at submitting a palm print. Graham responded by suggesting that the officers would obtain a search warrant if Beavers refused, and also informed Beavers that he might ultimately be arrested notwithstanding his cooperation. Beavers eventually acquiesced, was taken to the troopers’ station for a palm print to be taken, and was later returned to his mother’s residence by the troopers.
B. Proceedings
In presenting its case to the grand jury, the prosecution relied in part upon Beavers’s confession to Trooper Graham. The grand jury returned an indictment for first-degree robbery against Beavers.
Beavers moved to suppress his confession in superior court, alleging that it had been involuntarily given and obtained in violation of his Miranda, rights.1 The state opposed Beavers’s motion. After an evidentiary hearing, the superior court ruled that the troopers had not violated Beavers’s Miranda rights because Beavers was not in custody during the interview.
However, the superior court also found that Beavers’s confession had been involuntary. The court noted the “politely confrontational” tone of Graham’s interrogating tactics; that Beavers was only sixteen at the time of the interview; that the interview had occurred in the troopers’ vehicle; that the troopers had subjected Beavers to “coercive suggestion” by identifying themselves as law enforcement officers; that Graham had represented to Beavers his alleged knowledge of numerous details surrounding the crimes; and that Graham had dominated the conversation through his constant questions. The court also emphasized Graham’s statements that Beavers would be “hammered” if he tried to conceal the truth from the troopers, that Beavers “needfed] to get this cleaned up,” and that he. should tell the troopers the truth about the robberies.
Based upon Graham’s statements to Beavers and the circumstances surrounding the interview, the superior court found that Graham had excessively pressured-Beavers and essentially indicated to him that he lacked any choice but to confess. As a result, the court concluded that Beavers’s will had been overcome and that his confession was coerced. The court thus granted Beavers’s motion to suppress the confession and dismissed the indictment against him.
The state appealed the superior court’s disposition of the voluntariness issue to the court of appeals,2 which reversed the lower court’s determination. After reviewing the circumstances surrounding Beavers’s confession, the court of appeals concluded that his age, the troopers’ tactics, and the tone of the interview were insufficient to overcome Beavers’s will.
The court of appeals also held that Graham’s statement to Beavers that he would be “hammered” if he lied did not render Beavers’s confession involuntary. Analogizing the trooper’s threat to a promise of more favorable treatment, the court of appeals analyzed Beavers’s confession under the “totality of circumstances” approach and determined that his statement was voluntary notwithstanding the threat. The court of appeals thus reversed the superior court’s order and reinstated Beavers’s indictment.
Beavers seeks reversal of both the reinstatement of his indictment and the determination that his confession was voluntary. We granted Beavers’s petition, directing the parties to address, inter alia, the issue of whether an officer’s threat of harsher treatment should be analyzed in the same manner as a [1044]*1044promise of leniency when evaluating the vol-untariness of a suspect’s confession.
III. STANDARD OF REVIEW
We review the trial court’s determination concerning the voluntariness of Beavers’s confession as a mixed question of law and fact.3 Our review reflects the three-part nature of the lower court’s inquiry: “First, the trial judge must find the external, phenomenological facts surrounding the confession. Second, from these external facts, the judge must infer an internal, psychological fact: the mental state of the accused. Finally, the judge must assess the legal significance of this inferred mental state.” 4
The first step of this process involves the trial judge’s role in fact-finding and weighing the credibility of witnesses; we review the judge’s findings of historical fact deferentially, and will overturn -them only if clearly erroneous.5 In determining the accused’s mental state and its legal significance, however, we conduct an independent examination of the entire record and base our conclusion upon the totality of circumstances surrounding the confession,6!
IV. DISCUSSION
A. Alaska Law Regarding the Voluntariness of Confessions ■
Legal principles derived from our previous decisions provide the framework for addressing the issues in the present case. “A confession is not admissible into evidence unless it is voluntary. In determining whether a confession is the product of a free will or was the product of a mind overborne by coercion the totality of circumstances surrounding the confession must be considered.”7 Among the circumstances relevant to the court’s determination of vol-untariness are “the age, mentality, and prior criminal experience of the - accused; the length, intensity and frequency of interrogation; the existence of physical deprivation or mistreatment; and the existence of threat or inducement.”8
The prosecution must prove the voluntariness of the confession by a preponderance of the evidence.9 When the accused is a juvenile, the state assumes a particularly heavy burden of. proof.10 We have also recognized “[t]he manner of interrogation, including whether any threats or promises induced the confession, ... [as] an important factor to be considered.”11 We have repeatedly quoted the test enunciated in Bram v. United States12 as a baseline for voluntariness analysis:
[A] confession, in order to be admissible, must be free and voluntary; that is, must not be extracted by any sort of threats or violence, nor obtained by any direct or implied promises, however slight, nor by the exertion of any improper influence.[13]
Significantly, • however, Bram’s seemingly absolute prohibition on all promises is not dispositive:14
That language has never has never been applied-with ... wooden literalness_ The Supreme Court has consistently made clear that the test of voluntariness is whether an examination of all the circum[1045]*1045stances discloses that the conduct of law enforcement was such as to overbear (the defendant’s) will to resist and bring about confessions not freely self determined.[15]
We have noted that the facts of Bram do not require a blanket rule against promise-induced confessions; that subsequent Supreme Court decisions demonstrate the importance of case-specific factual nuances in determining voluntariness; and that a per se approach might result in the loss of reliable and probative confessions.16
We have thus expressly “reject[ed] a per se rule which would condemn any incriminatory statement obtained by means of a promissory inducement,” and have instead adopted a “totality of circumstances” approach in examining the voluntariness of an accused’s confession.17 We have employed this multi-factor analysis even when police have engaged in improper conduct to induce confessions, and we have affirmed the volun-tariness of inculpatory statements induced by police trickery and misrepresentation of evidence.18
But in Webb v. State19 we recognized that “certain improper conduct is so coercive as to render a Miranda waiver involuntary without regard to the totality of circumstances.”20 The police officer in Webb had conditioned the return of a suspect’s driver’s license to him upon his agreement to provide a statement.21 We concluded that the officer’s conduct was sufficiently coercive to render the suspect’s confession involuntary notwithstanding the other factors surrounding the interrogation.22
We noted that the suspect in Webb was “presented with the illusory choice of exercising his right to remain silent and losing a valuable property interest, his driver’s licence, and making an incriminating statement to secure [its] return.”23 Condemning this Hobson’s choice, we held that Miranda waivers “obtained by conditioning the exercise of the constitutional guarantee against self-incrimination against the loss of another constitutionally protected interest” were per se involuntary.24
B. Police Threats Are Presumptively Coercive.
Although we have repeatedly stated that a police officer’s promissory inducement represents only one factor in the “totality of circumstances” approach, we have never expressly evaluated a police officer’s threat of harsher treatment under the same analysis. The issue of whether courts should analyze promises and threats identically constitutes the central issue in the present appeal, and it is one of first impression for this court.
Beavers asks us to hold police threats per se coercive, obviating judicial examination of the other factual circumstances surrounding an accused’s confession. The state argues that a threat should, like an officer’s promise of leniency, represent merely one of several factors for consideration under this court’s “totality of circumstances” approach.
A criminal suspect’s right to remain silent in the face of police interrogation represents one of the most fundamental aspects of our constitutional jurisprudence.25 [1046]*1046It includes the right to terminate an interrogation at any time.26 We regard any potential encroachment upon this right with the utmost concern. A law enforcement officer’s threat of harsher than normal treatment— however phrased — essentially conveys to criminal suspects that they will be punished for their silence, including any refusal to give further answers.27 Threats of harsher treatment for refusing to confess present suspects with the same type of choice which we found to be unacceptable in Webb.28 Suspects are told, in effect, that they must give up their constitutional right to silenee or they will suffer greater punishment. We view such threats with disfavor.29 Where they are used, the resulting confession should be considered involuntary unless the state can show affirmatively that the confession was voluntarily made.30
In reaching our conclusion, we draw guidance from the Ninth Circuit’s decision in United States v. Harrison.31 Harrison was suspected by federal authorities of money laundering. Without warning, fifteen federal agents entered Harrison’s house with weapons drawn, arrested'Harrison and her companion, and searched her home.32 The agents' advised Harrison of her Miranda rights, after which an agent informed her of evidence linking her to the crime under investigation.33 The agent then told Harrison that she could potentially receive a twenty-year sentence for her participation in the crime, and asked whether she thought it would.be better if the judge was told of her cooperation or noncooperation.34 Harrison responded that it would be better if the judge was informed of her cooperation, and she proceeded to confess her criminal involvement to the agents.35 The district court found Harrison’s confession voluntary and ultimately convicted her of money laundering.36
The Ninth Circuit reversed Harrison’s conviction, holding her confession involuntary.37 While expressing its continued adherence to the “totality of circumstances” approach, the court nevertheless established [1047]*1047an exception for confessions induced by police threats to inform the prosecutor of a suspect’s refusal to cooperate. According to the court, “there are no circumstances in which law enforcement officers may suggest that a suspect’s exercise of the right to remain silent may result in harsher treatment by a court or prosecutor.”38
The Harrison court reiterated the permissibility of confessions secured by an officer’s promise of leniency.39 The court also acknowledged the arguable equivalence between such promises and police threats to inform the prosecutor of a suspect’s refusal to cooperate, noting that “[i]n many ways, both types of statements are simply different sides of the same coin: “waive your rights and receive more favorable treatment’ versus ‘exercise your rights and receive less favorable treatment.’”40 The Ninth Circuit determined, however, that
[t]he two types of statements are not entirely interchangeable. Defendants may get some benefit from learning about the possibility of reduced sentences, though that benefit would hardly vanish if the government communicated the prospect of leniency through defendants’ attorneys rather than at the time of arrest. We also have observed that in most circumstances, speculation that cooperation will benefit the defendant or even promises to recommend leniency are not sufficiently compelling to overbear a defendant’s will.[41]
In distinguishing promises to communicate a suspect’s cooperation to the prosecutor from threats to inform the prosecutor of the suspect’s lack of cooperation, the Harrison court reasoned:
Refusal to cooperate is every defendant’s right under the fifth amendment. Under our adversary system of criminal justice, a defendant may not be made to suffer for his silence. Because there is no legitimate purpose for the statement that failure to cooperate will be reported and because its only apparent objective is to coerce, we disapprove the making of such representations[42]
The Ninth Circuit thus rejected the government’s request to examine Harrison’s in-culpatory statement in context of all the circumstances involved in the case and held the agent’s suggestion that he might inform the judge of Harrison’s failure to cooperate inherently coercive.43
We find Harrison’s reasoning persuasive and agree with the Ninth Circuit’s distinction between promises of leniency and threats of harsher treatment. We also note that at least two other cases have taken a similar approach.
In United States v. Tingle, a credit union employee (Tingle) was under suspicion of stealing funds.44 After claiming that she had been attacked by an unknown assailant who had tied her up and stolen money from the safe of the credit union, Tingle was escorted by two FBI agents to their vehicle for further questioning.45 During the hour-long interview, Tingle initially repeated the alibi she had given earlier46 The agents accused her of lying and explained to her the advantages of truthfully cooperating with the investigation.47 They enumerated the crimes — and corresponding prison terms — for which she might be found guilty.48 Tingle continued to deny the accusations.49
The agents explained to Tingle that it was in her best interest to cooperate, and told her that, depending on her decision, they would inform the prosecutor either of her coopera[1048]*1048tion with the investigation or her refusal to do so.50 They also indicated that she might lose contact with her young child if she was ultimately jailed.51 Tingle began to sob and visibly shake during the interview.52 She eventually confessed to the crime and was convicted.53 The Ninth Circuit reversed the conviction, holding that the agent’s threats had invalidated her confession.54
In State v. Strayhand, a theft and robbery suspect was arrested and interrogated at the police station.55 The interviewing detectives repeatedly threatened Strayhand with enhanced punishment for failure to cooperate with the investigation, warning him that they would ask for “a lot of jail time,” would “hang him in court,” and would “have it made” after informing the judge of his refusal to confess.56 During a subsequent interview later that day, Strayhand admitted his guilt and was eventually convicted at trial.57 The Arizona Court of Appeals reversed Strayhand’s conviction, holding his confession involuntary due to the detectives’ threats of harsher treatment.58
V. CONCLUSION
Threat-induced confessions should be considered presumptively involuntary absent evidence affirmatively indicating that the suspect’s will was not overcome by the threats. We have reviewed the record in the present case and agree substantially with the trial court’s view of the evidence. Trooper Graham’s threat to Beavers that he would be “hammered” if he attempted to hide his conduct from Graham and that “we’re going to have to talk about that” conveyed an unmistakable message that Beavers would be punished for exercising his constitutional right to silence: There are no affirmative indications that the trooper’s threats of harsher treatment were ineffective. We therefore hold that the court of appeals’ decision must be REVERSED and the superior court’s ruling reinstated.