¶1OPINION
¶2I. INTRODUCTION
¶3The 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.
¶4II. FACTS AND PROCEEDINGS
¶5A. Facts
¶6The 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.
¶7*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?”
¶8Graham 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.
¶9He 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.
¶10Following 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?
¶11(Emphasis added.)
¶12Beavers 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.
¶13Graham 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?
¶14Beavers 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.
¶15Graham acknowledged Beavers’s forthrightness during the interview. He asked *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.
¶16B. Proceedings
¶17In 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.
¶18Beavers moved to suppress his confession in superior court, alleging that it had been involuntarily given and obtained in violation of his Miranda, rights.
¶19However, 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.
¶20Based 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.
¶21The state appealed the superior court’s disposition of the voluntariness issue to the court of appeals,
¶22The 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.
¶23Beavers 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 *1044promise of leniency when evaluating the vol-untariness of a suspect’s confession.
¶24III. STANDARD OF REVIEW
¶25We review the trial court’s determination concerning the voluntariness of Beavers’s confession as a mixed question of law and fact.
¶26The 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.
¶27IV. DISCUSSION
¶28A. Alaska Law Regarding the Voluntariness of Confessions ■
¶29Legal 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.”
¶30The prosecution must prove the voluntariness of the confession by a preponderance of the evidence.
[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 ]
¶31Significantly, • however, Bram’s seemingly absolute prohibition on all promises is not dispositive:
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*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 ]
¶32We 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.
¶33We 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.
¶34But in Webb v. State
¶35We 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.”
¶36B. Police Threats Are Presumptively Coercive.
¶37Although 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.
¶38Beavers 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.
¶39A criminal suspect’s right to remain silent in the face of police interrogation represents one of the most fundamental aspects of our constitutional jurisprudence.
¶40In reaching our conclusion, we draw guidance from the Ninth Circuit’s decision in United States v. Harrison.
¶41The Ninth Circuit reversed Harrison’s conviction, holding her confession involuntary.
¶42The Harrison court reiterated the permissibility of confessions secured by an officer’s promise of leniency.
[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 ]
¶43In 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 ]
¶44The 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.
¶45We 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.
¶46In United States v. Tingle, a credit union employee (Tingle) was under suspicion of stealing funds.
¶47The 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*1048tion with the investigation or her refusal to do so.
¶48In State v. Strayhand, a theft and robbery suspect was arrested and interrogated at the police station.
¶49V. CONCLUSION
¶50Threat-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.
¶51. See Miranda v. Arizona, 384 U.S. 436, 86 S-.Ct. 1602, 16 L.Ed.2d 694(1966).
¶52. Beavers cross-appealed the superior court’s determination that he was not in custody for Mirandapurposes. The court of appeals affirmed the superior court’s custody ruling, and Beavers does not raise the issue in his petition to this court.
¶53. See State v. Ridgely, 732 P.2d 550, 554 (Alaska 1987).
¶55. See id.
¶56. See id.
¶57. Sovalik v. State, 612 P.2d 1003, 1006 (Alaska 1980) (quoting Ladd v. State, 568 P.2d 960, 967 (Alaska 1977)).
¶58. Sprague v. State, 590 P.2d 410, 414 (Alaska 1979) (citation omitted).
¶59. See id. at 413.
¶60. See S.B. v. State, 614 P.2d 786, 789 (Alaska 1980) (citing Quick v. State, 599 P.2d 712, 720 (Alaska 1979)).
¶61. Id.(citing Sprague, 590 P.2d at 414).
¶62. 168 U.S. 532, 542-43, 18 S.Ct. 183, 42 L.Ed. 568 (1897).
¶63. Webb v. State, 756 P.2d 293, 296 (Alaska 1988); Stobaugh v. State, 614 P.2d 767, 771 (Alaska 1980); Sovalik, 612 P.2d at 1006; S.B., 614 P.2d at 789; Sprague, 590 P.2d at 413 n. 6.
¶64. See Stobaugh, 614 P.2d at 771.
¶65. Id.at 771-72 (quoting United States v. Ferrara, 377 F.2d 16, 17 (2d Cir.1967), cert. denied, 389 U.S. 908, 88 S.Ct. 225, 19 L.Ed.2d 225 (1967)).
¶66. See id.at 772 (citing United States v. Williams, 447 F.Supp. 631, 636-37 (D.Del.1978)).
¶67. Id.As noted infra, however, we have recognized that some police conduct is so coercive as to automatically render a confession involuntary notwithstanding other factors surrounding the accused’s interrogation.
¶68. See Sovalik, 612 P.2d at 1007 & n. 4 (confession induced in part by police misrepresentation of inculpatory evidence; trickery in obtaining confession merely one factor in analysis of volun-tariness).
¶69. 756 P.2d 293 (Alaska 1988).
¶71. See id.
¶72. See id.
¶75. The right is guaranteed by the Fifth Amendment to the Constitution of the United States and article I, section 9 of the Alaska Constitution. See Miranda, 384 U.S. at 467, 86 S.Ct. 1602 ("[T]here can be no doubt that the Fifth Amend*1046ment privilege is available outside o£ criminal court proceedings and serves to protect persons in all settings in which their freedom of action is curtailed in any significant way from being compelled to incriminate themselves.”); Malloy v. Hogan, 378 U.S. 1, 7, 84 S.Ct. 1489, 12 L.Ed.2d 653 (1964) ("[T]he American system of criminal prosecution is accusatorial, not inquisitorial, and ... the Fifth Amendment privilege is its essential mainstay.”).
¶76. See Miranda, 384 U.S. at 445, 86 S.Ct. 1602 (stating that"[t]he mere fact that [the defendant] may have answered some questions or volunteered some statements on his own does. not deprive him of the right to refrain from answering any further inquiries”).
¶77. See Malloy, 378 U.S. at 7, 84 S.Ct., 1489 ("[T]he Fifth Amendment guarantees ... the right of a person to remain silent unless he chooses to speak in the unfettered exercise of his own will, and to suffer no penalty ... for such silence."); United States v. Harrison, 34 F.3d 886, 891 (9th Cir.1994) ("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.”); United States v. Leon Guerrero, 847 F.2d 1363, 1366 n. 2 (9th Cir.1988) ("Threatening to inform the prosecutor of a suspect’s refusal to cooperate violates her fifth amendment right to remain silent.”).
¶78. 756 P.2d at 297 (holding that state trooper’s conduct in retaining defendant’s driver’s license and conditioning its return on his giving statement was coercive and made defendant’s Mirandawaiver involuntary).
¶79. See Miranda, 384 U.S. at 468 n. 37, 86 S.Ct. 1602 ("it is impermissible to penalize an individual for exercising his Fifth Amendment privilege when he is under police custodial interrogation”).
¶80. Because this represents a step toward a literal interpretation of Bram’s injunction against the use of threats and away from complete reliance on a totality of circumstances approach, and may therefore be more demanding than federal constitutional law, we base this ruling on article I, section 9 of the Alaska Constitution.
¶81. 34 F.3d 886 (9th Cir.1994).
¶82. See id. at 890.
¶83. See id.
¶84. See id.
¶85. See id.
¶86. See id.
¶87. See id. at 892-93.
¶88. Id. at 891-92.
¶89. See id. at 891.
¶91. Id. at 891 (citation omitted).
¶92. Id.(quoting United States v. Tingle, 658 F.2d 1332, 1336 n. 5 (9th Cir.1981)).
¶93. See id. at 891-92.
¶94. 658 F.2d 1332, 1333 (9th Cir.1981).
¶95. See id.
¶96. See id.
¶97. See id. 1333-34.
¶98. See id.
¶99. See id. at 1334.
¶100. See id.
¶101. See id. & n. 2.
¶102. See id. at 1334.
¶103. See id.
¶104. See id. at 1336-37.
¶105. 184 Ariz. 571, 911 P.2d 577, 581-82 (App.1995).
¶107. See id. at 581, 584.
¶108. See id. at 585-88, 594.