
    State of Wisconsin, Plaintiff-Appellant, v. Yen Yang, Defendant-Respondent.
    
    Court of Appeals
    
      No. 99-1246-CR.
    
    
      Submitted on briefs October 14, 1999.
    
    Decided February 8, 2000.
    
    2000 WI App 63
    (Also reported in 608 N.W.2d 703.)
    
      On behalf of the plaintiff-appellant, the cause was submitted on the briefs of James E. Doyle, attorney general, and David J. Becker, assistant attorney general.
    On behalf of the defendant-respondent, the cause was submitted on the brief of David J. Matyas, of De Pere.
    Before Cane, C.J., Hoover, P.J., and Peterson, J.
    
      
      Petition to review denied.
    
   HOOVER, P.J.

¶ 1. The State appeals an order granting a motion to suppress statements and evidence. The State contends that the trial court erred by applying the fruit of the poisonous tree doctrine to Miranda violations that did not also infringe upon Yen Yang's constitutional rights. The issues presented are whether physical evidence derived from statements obtained in violation of Miranda and a subsequent Mirandized statement are admissible.

¶ 2. Addressing these issues in reverse order, we conclude that Elstad's two-part test, adopted by our supreme court in State v. Armstrong, 223 Wis. 2d 331, 366-67, 588 N.W.2d 606 (1999), applies to determine a subsequent Mirandized statement's admissibility. A court must first examine the statement obtained in violation of Miranda: if it was voluntary, there was no constitutional violation and therefore no "tainted fruit." The second inquiry is whether the subsequent Mirandized statement was voluntarily given after a valid waiver oí Miranda rights. We conclude that all of Yang's statements were voluntarily given. Because the subsequent statement was obtained after a valid waiver of Yang's Miranda rights, it is admissible.

¶ 3. We next hold that the admissibility of physical evidence derived from an unwarned statement is governed by the same rationale. If the statement taken in violation of Miranda was voluntary, the fruit of the poisonous tree doctrine does not apply. Because Yang's statements leading the police to physical evidence were voluntary, that evidence is admissible. We therefore reverse the suppression order and remand for further proceedings.

¶ 4. The State also contends that the trial court erred by determining that Yang was in custody at the time of his unwarned statements and that the public safety exception does not apply. We deem it unnecessary to consider these arguments because the State concedes that it is in fact only "concerned" with the circuit court's ruling regarding the physical evidence derived from Yang's first statement and with the Mirandized statement. Therefore, the trial court's order suppressing the pre-warning statement is not disturbed on appeal.

BACKGROUND

¶ 5. The DePere Police Department received a call on September 9,1998, that there were some "suspicious parties crawling the fence" to enter the Brown County fairgrounds from private property. The caller described the individuals as two Asian males. The activity was suspicious because, among other things, the gates to the fairgrounds were open so there was no need to climb over the fence to get in. The police responded and observed two Asian males, one of whom was Yang, walking in the area. The officers detained them and informed Yang that they had received a trespassing complaint. When the police asked Yang why he was in the area, he responded that he was looking for a lost ring.

¶6. Shortly thereafter, Brown County sheriffs deputies arrived at the scene. Lieutenant Paul Loppnow took over the investigation and asked Yang what he was doing. Yang again explained that he was looking for a ring. Loppnow told Yang that "we had a problem here over the weekend and there was a shooting here" and asked, "did you hear about that?" Yang indicated he had, but when pressed, disavowed any knowledge concerning the shooting. Loppnow asked Yang if he would go to the sheriff s department to speak with investigators, and Yang agreed. Loppnow explained to Yang that he was not under arrest or in custody, and Yang nodded in the affirmative.

¶ 7. Yang was transported in a marked patrol car. Loppnow informed the driver that Yang was not under arrest or in custody but was willing to talk to the sheriffs investigators. Yang's hands were handcuffed in front of his body before he was placed in the squad. Loppnow later testified that had Yang been under arrest, he would have been handcuffed with his hands behind his back. Loppnow and other officers told Yang that he was being handcuffed for the officer's safety. Loppnow again told Yang that he was not under arrest and not in custody.

¶ 8. When Yang arrived at the sheriffs department, he was placed in a second floor interview room. The door was closed but not locked. The handcuffs were removed, and Yang was left alone for a short time. When Loppnow returned, he asked if Yang wanted something to drink or to use the bathroom. Yang responded that he did not. Loppnow told Yang that someone would be in to speak with him.

¶ 9. Loppnow returned to his office and was informed a short while later that a firearm might be hidden near the fairgrounds along the river. He was aware that young people frequently play next to the river in the general area in question and was therefore concerned about the possibility of someone discovering the firearm. Based upon his concern, Loppnow and other officers went to the fairgrounds and started searching for the firearm.

¶ 10. Sheriffs investigator Ronald Smith first began to talk to Yang between a half-hour and forty-five minutes after Yang had been placed in the interview room. First, Smith again asked Yang if he wanted something to drink. Yang responded no. After identifying himself, Smith told Yang that he wanted to ask Yang about why he was at the fairgrounds. Smith did not give Yang Miranda warnings at that time. They talked for some time about the lost ring. There were interruptions while other officers provided Smith with information they obtained from other individuals. Smith was informed that Yang and his companions were not looking for a lost ring, but were looking for a firearm that had been involved in the shooting. After receiving this information, Smith believed Yang was involved in the incident. He told Yang that he wanted to know where the firearm was because he "didn't want any little kids to find the gun and end up hurting them-sel[ves]." Smith also told Yang he expected him to cooperate. Yang said he would and informed Smith of the firearm's location. Smith left the room to relay the information to officers at the fairgrounds; they were, however, unable to locate the firearm based on the information Yang provided.

¶ 11. Smith returned to the interview room and asked Yang whether he would be willing to go to the fairgrounds and point out the area where the weapon could be found. Before Smith could finish his sentence, Yang stood up and indicated he would cooperate. At that point, Smith asked Yang whether he understood that he had the right to have an attorney present. Yang said he understood his rights and wanted to cooperate; he just wanted to get it over with. Smith also told Yang that he had a right not to talk and again, Yang indicated he understood. Smith did not, however, give the complete Miranda warnings. Smith testified that normally he would have administered complete Miranda warnings but did not do so because he lacked the time. The officers at the fairgrounds wanted Yang right away, and Smith did not know how long it would take to go through the Miranda warnings. Smith, another officer and Yang went to the fairgrounds. Yang assisted in finding the firearm by pointing out the area where it was located.

¶ 12. Smith accompanied Yang back to the same interview room at the sheriffs department, where Smith read Yang the Miranda warnings. Yang indicated that he understood them. Yang also read and signed a waiver form stating that he "understood everything." Yang then answered Smith's questions about the shooting incident and the recovered firearm. Yang's answers were reduced to writing and, after reviewing the written statement, Yang signed it.

¶ 13. Yang was charged with two counts of aggravated battery, one count of carrying a concealed weapon, two counts of harboring or aiding a felon and one count of possession of a dangerous weapon by a child. The charges arose out of the shooting incident at the Brown County fairgrounds. Yang's primary role in the shooting was to hide the firearm that had been used. After the preliminary hearing, Yang was bound over for trial on all six charges. He filed motions seeking to suppress all of his statements to law enforcement officers and the firearm whose general location Yang revealed in his statements to Smith. The trial court suppressed all of Yang's statements and the firearm.

¶ 14. The court decided that Yang was in custody at the time he gave his first statement. It determined that although the statement was voluntary, it must be suppressed because it was made without the benefit of Miranda warnings. The court then considered the postwarning statements and the firearm. Although the court acknowledged Armstrong's holding, it distinguished it on the basis of factual differences. First, Armstrong was not a suspect until he incriminated himself, whereas Yang became a suspect based on information the authorities obtained from others. Second, Armstrong gave the same information in both his pre- and post -Miranda statements. In Yang's post-Miranda statement, however, in addition to merely acknowledging that he knew where the firearm was, he also admitted his involvement in the shooting incident. The court found ultimately that Yang knowingly and intelligently waived his Miranda rights and that his second statement to Smith was voluntary. It nevertheless concluded that the post -Miranda statement and the firearm were "fruit of the poisonous tree" and insufficiently attenuated from the pre-warning statement. The court therefore also suppressed the post -Miranda statement and the firearm. This appeal followed.

ANALYSIS

¶ 15. Initially, we briefly address the issues that we do not decide. First, the State contends that the circuit court erred by determining that Yang was in custody at the time his statements were taken and by failing to apply the public safety exception to the Miranda rule under the facts of this case. The State concedes, "[I]t is primarily the last two items [suppression of the postwarning statements and the firearm], and the ground upon which they were suppressed . . . with which the state is concerned." It apparently believes that Yang's pre-Miranda statement is not essential if the State can admit his post -Miranda confession. Because we conclude that Yang's postwarning statements and the firearm are admissible, we do not determine whether Yang was in custody or whether the public safety exception applies. Our analysis relies upon the circuit court's determinations that Yang was in custody at the time of his pre-warning statements and that the public safety exception does not apply. Therefore, we do not disturb the circuit court's order suppressing the pre-warning statements, although they may be used to impeach Yang's credibility should he choose to testify. See Harris v. New York, 401 U.S. 222, 225-26 (1971).

¶ 16. We also decline to address Yang's contention that he was illegally detained and that all resulting evidence should be suppressed. Yang raised the issue briefly at the suppression hearing. At the end of the time available for the hearing, the court told the parties, "if there was anything further that needs to be addressed from anyone's perspective . . . you can certainly submit that in writing. And I will . . . address those when we have a little more time ... ." The record does not demonstrate that Yang availed himself of this opportunity so that the circuit court could address his argument. He has therefore failed to preserve the issue for appeal. See State v. Woods, 144 Wis. 2d 710, 716, 424 N.W.2d 730 (Ct. App. 1988).

STANDARD OF REVIEW

¶ 17. Our analysis involves various issues that we decide under different standards of review. We will not upset the circuit court's evidentiary findings unless they are clearly erroneous. See Armstrong, 223 Wis. 2d at 352. We must determine the applicable law, which is a legal question that we answer without deference to the circuit court. See State v. Keith, 216 Wis. 2d 61, 69, 573 N.W.2d 888 (Ct. App. 1997). Whether those facts meet the appropriate legal standard presents a question of law that we decide independently of the circuit court. See Armstrong, 223 Wis. 2d at 353.

ADMISSIBILITY OF THE MIRANDIZED WRITTEN STATEMENT

¶ 18. The State contends that the circuit court erroneously suppressed the postwarning oral and written statements on the grounds that they were the tainted fruit of the earlier statements. Relying on Armstrong, it asserts that the "fruit of the poisonous tree" doctrine does not apply because Yang's constitutional rights were not violated.

¶ 19. In Armstrong, our supreme court rejected the application of the "tainted fruit" doctrine to suppress a post -Miranda statement, despite an earlier Miranda violation. See Armstrong, 223 Wis. 2d at 359-60. Armstrong was in custody on another matter and was being questioned as a possible witness to a homicide when he gave statements implicating himself in the murder and recounting his actions after the victim died. See id. at 338-39. After receiving this information but during the same interview, the police first advised Armstrong of his Miranda rights. See id. at 339-40. After waiving his Miranda rights, Armstrong finished a map directing the police to certain physical evidence. See id. Later, the officers returned to Armstrong's cell and gave him a written statement reflecting his earlier oral admissions. See id. at 341. After Armstrong read it and made some changes, the police administered a second Miranda warning. Armstrong waived his rights and signed the written statement, initialing his changes. See id. Later, Armstrong sought to suppress his statements as fruit of the poisonous tree. See id. at 359.

¶ 20. In rejecting application of the "tainted fruit" doctrine, the court relied on Elstad's analysis. In Elstad, the Court examined the fruit of the poisonous tree doctrine and determined that it only applies to a constitutional violation. See id. at 305-09. Failure to administer Miranda warnings is not in itself a violation of the Fifth Amendment. "The Fifth Amendment prohibits use by the prosecution in its case in chief only of compelled testimony." Elstad, 470 U.S. at 306-07. The Court concluded:

It is an unwarranted extension of Miranda to hold that a simple failure to administer the warnings, unaccompanied by any actual coercion or other circumstances calculated to undermine the suspect's ability to exercise his free will, so taints the investigatory process that a subsequent voluntary and informed waiver is ineffective for some indeterminate period. Though Miranda requires that the unwarned admission be suppressed, the admissibility of any subsequent statement should turn in these circumstances solely on whether it is knowingly and voluntarily made.

Id. at 309.

¶ 21. The analysis therefore involves a two-part inquiry. The first test is whether the original Miranda violation is also a constitutional violation. Because Miranda "serves the Fifth Amendment [and the] Fifth Amendment prohibits [the prosecution's use] of compelled testimony," Elstad, 470 U.S. at 306-07, the inquiry whether there was a constitutional violation usually concerns whether the defendant gave his statement freely and voluntarily. Therefore, if the statement was voluntary, it is Miranda's prophylactic rule and not a constitutional right that is violated. If involuntary, the Fifth Amendment is violated and we examine any subsequent statement under a fruit of the poisonous tree analysis. To determine voluntariness, we examine whether police coercion overcame the defendant's free will. See, e.g., State v. Clappes, 136 Wis. 2d 222, 235-36, 401 N.W.2d 759 (1987).

¶ 22. Elstad's second test is whether the subsequent statement "was [also] a voluntary statement made after a valid administration of the Miranda warnings as well as a knowing and voluntary waiver of the constitutional privilege which Miranda protects." Armstrong, 223 Wis. 2d at 365. Assuming a valid waiver, the inquiry again addresses police coercion. That a ’defendant has already given a statement is, however, "no warrant for presuming coercive effect." Id. at 363. Indeed, "[t]he fact that a suspect chooses to speak after being informed of his rights is . . . highly probative in determining the voluntariness of the suspect's post -Miranda statements." Id. (citation omitted).

¶ 23. Yang nevertheless contends that the "fruit of the poisonous tree" doctrine has bearing on a Wisconsin court's Elstad analysis. He reads Armstrong as limited to its facts, and distinguishable because Yang, unlike Armstrong, was suspected of criminal activity when he made his initial statements, and Yang gave far more incriminatory information post -Miranda than pre-Miranda, while Armstrong provided the same information in both statements.

¶ 24. Armstrong is neither limited to its facts nor materially distinguishable. Yang misconstrues Armstrong's underlying rationale. Its analysis was not concerned with whether Armstrong was a suspect or with the amount of information given pre- and post-Miranda. Relying on Elstad, the Armstrong majority determined that, absent a constitutional violation in the first instance, there is no poisonous tree and consequently, no tainted fruit. Therefore, the appropriate inquiry in analyzing the admissibility of the post-Miranda statement is whether both statements were voluntarily given and whether Miranda rights were validly waived.

¶ 25. Yang contends that his pre-Miranda statements were not voluntary. He claims that they were "the product of continual police pressure." We recently held that:

[W]hether a defendant's statements to law enforcement are voluntary is determined in the first instance by an analysis of whether there were improper pressures exercised by the police. The inquiry ends if the law enforcement methods were not coercive.

State v. Williams, 220 Wis. 2d 458, 464-65, 583 N.W.2d 845 (Ct. App. 1998) (citation omitted). Only if the police practices were coercive does a court need to balance the accused's personal characteristics against the governmental activity that may have induced the statement. See Clappes, 136 Wis. 2d at 239-40.

¶ 26. The circuit court found that the detectives engaged in no improper practices. This finding is not contrary to the great weight and clear preponderance of the evidence and we are thus bound by it. See id. at 235. Yang was not threatened, lied to or physically abused. No promises of leniency were made, and the interrogation was not lengthy. The court's finding is further supported by Yang's testimony that Smith, who took all of Yang's statements, "was pretty nice" and that the officers had not done anything he considered unfair.

¶ 27. Notwithstanding its finding of no improper police practices, the court also considered several of the statements that Smith made to Yang: that the police knew Yang was looking for a firearm and not a ring and that a child might find the firearm. The court determined that these statements were not coercive and would not have caused Yang to give his statements involuntarily. In so determining, the court considered factors unique to Yang, such as his learning and thinking difficulties, but found upon the evidence as a whole that those factors did not demonstrate that Yang's statement was coerced. These findings lead inevitably to the legal conclusion that the statements were voluntarily given.

¶ 28. We hold that the officers' failure to administer the Miranda warnings prior to Yang's oral statements was not a constitutional infringement. We next examine whether Yang's subsequent written statement is admissible pursuant to Elstad's second test, i.e., whether it was voluntarily given after a valid administration of the Miranda warnings and a knowing and voluntary waiver of the constitutional privilege that Miranda protects.

¶ 29. The circuit court found that Yang provided his written statement voluntarily after he had been read the Miranda warnings and "intelligently and knowingly" waived his rights. The record supports that finding. After Yang received his full Miranda warnings, he signed the "Notification and Waiver Form" and indicated to Smith that he understood his rights and would speak with him. Yang continued to cooperate with Smith by providing the written statement.

¶ 30. Yang does not point to any specific acts of police coercion in obtaining the written statement. He nevertheless contends that "the continuum or evolution of the situation which [he] experienced [exhausted his] ability to exercise his free will...." The essence of Yang's argument is that because of all that he had previously done to implicate himself, the taint of the earlier statements made his written statement involuntary.

¶ 31. We may not presume that Yang's subsequent statement was coerced by virtue of his earlier unwarned admissions. See Armstrong, 223 Wis. 2d at 365. Indeed, Yang's choice to continue to cooperate and divulge additional information after he received his Miranda rights is "highly probative" to our inquiry. See Armstrong, 223 Wis. 2d at 363-64. We conclude that Yang voluntarily provided his written statement and that he did so after knowingly and voluntarily waiving his Miranda warnings. Accordingly, we determine that Yang's written statement is admissible.

ADMISSIBILITY OF THE FIREARM

¶ 32. The State next contends that we should extend the Armstrong holding to apply to physical evidence obtained as a result of a Miranda violation. It concedes there is no controlling United States Supreme Court or Wisconsin appellate decision, but claims that Michigan v. Tucker, 417 U.S. 433 (1974), and Elstad "plainly teach that the 'fruit of the poisonous tree' doctrine has no application to physical evidence . . . discovered as the result of statements obtained in violation of Miranda." Yang counters that revealing the firearm's location was testimonial in nature and flowed directly from the Miranda violation. The firearm, he maintains, is derivative evidence from that violation and should therefore be suppressed as "tainted fruit." Yang agrees with the State that there is no controlling precedent concerning the admission of the firearm. Moreover, he argues that admitting evidence that derives from a Miranda violation would set a dangerous precedent because future Miranda violations would not be deterred, but perhaps encouraged.

¶ 33. The State does not dispute that Yang's act of revealing the firearm's location was testimonial in nature. Because it followed unwarned custodial questioning in violation of Miranda, it must be suppressed. Whether the derivative physical evidence must also be suppressed is governed by Tucker and Elstad.

¶ 34. In Tucker, the Supreme Court was asked to apply the "tainted fruits" doctrine to the testimony of a witness whose identity was discovered as the result of a statement obtained in violation of Miranda. In declining to extend the doctrine to the facts in Tucker, the Supreme Court noted that the unwarned questioning did not abridge Tucker's Fifth Amendment privilege, "but departed only from the prophylactic standards later laid down by this court in Miranda to safeguard that privilege." Id. at 445-46. Because Tucker's constitutional rights were not infringed, the Court determined that the "fruit of the poisonous tree" doctrine did not apply. Id. at 445 n.19. As a result, although the direct evidence (Tucker's unwarned statement) had to be suppressed, the derivative evidence (the testimony of the witness discovered as a result of the unwarned statement) was admissible. See id. at 445-46.

¶ 35. Similarly, the Elstad majority held that the "tainted fruits" doctrine did not apply to the second confession for the same reasons the doctrine did not apply in Tucker. See id. at 308. Specifically, the Court held that "[sjince there was no actual infringement of the suspect's constitutional rights, the case was not controlled by the doctrine expressed in Wong Sun that fruits of a constitutional violation must be suppressed." Id. As a result, although the direct evidence (the defendant's first confession) had to be suppressed, the derivative evidence (the second confession that was obtained as a result of the first) was admissible. See id. at 309.

¶ 36. The logical extension of the Court's reasoning in Tucker and Elstad is that the "fruit of the poisonous tree" doctrine does not apply to physical evidence discovered as the result of a statement obtained in violation of Miranda's prophylactic rules, as opposed to a constitutional infringement. The Tucker and Elstad holdings could not be clearer: the "poisonous tree" in Wong Sun is a constitutional violation and, absent such a violation, there is no tainted fruit. It is well established that the failure to deliver Miranda warnings is not itself a constitutional violation. See, e.g., Elstad, 470 U.S. at 306-09. Accordingly, derivative physical evidence obtained as a result of an unwarned statement that was voluntary under the Fifth Amendment is not "tainted fruit."

¶ 37. The Supreme Court has answered Yang's policy argument regarding the "dangerous precedent" he claims we set today:

[T]he absence of any coercion or improper tactics undercuts the twin rationales — trustworthiness and deterrence — for a broader rule.
[Pjolicemen investigating serious crimes [cannot realistically be expected to] make no errors whatsoever. If errors are made by law enforcement officers in administering the prophylactic Miranda procedures, they should not breed the same irremediable consequences as police infringement of the Fifth Amendment itself.

Id. at 308-09 (citations omitted).

¶ 38. In light of our determination that a violation of Miranda's prophylactic rules by itself cannot be a "poisonous tree," whether the gun must be suppressed as "tainted fruit" turns on whether Yang's statements and testimonial act identifying the location of the gun were involuntary. Because we have concluded that Yang's pre-Miranda statements were voluntary, we conclude that the gun is admissible.

¶ 39. In conclusion, we hold that a subsequent Mirandized statement made after an earlier Miranda violation is admissible if both statements were voluntary and the subsequent Mirandized statement was given after a valid Miranda rights waiver. We conclude that Yang's unwarned and warned statements were given voluntarily and that there was a valid waiver. Accordingly, the Mirandized statement is admissible. We further hold that the admissibility of physical evidence derived from an unwarned statement is governed by the same rationale. If there was no constitutional violation, the fruit of the poisonous tree doctrine does not apply. Accordingly, that part of the order suppressing the non -Mirandized statement and the testimonial act of revealing the firearm is affirmed; that part of the order suppressing the post -Miranda statement and the firearm is reversed and the cause is remanded.

By the Court. — Orders affirmed in part; reversed in part and cause remanded. 
      
       This is an appeal from a nonfinal order. See WlS. STAT. § 974.05.
     
      
       See Miranda v. Arizona, 384 U.S. 436 (1966).
     
      
      
         See Oregon v. Elstad, 470 U.S. 298 (1985).
     
      
       During the round trip and while at the fairgrounds, Yang was not handcuffed.
     
      
      
         Supra page 2.
     
      
       The State certainly does not concede that Yang was in custody or that the public safety exception does not apply. Rather, we perceive its express identification of its primary concern as an admission that Yang's initial statement is of nominal evidentiary value. We appreciate the State's candor.
      Yang's Mirandized statement contains at least the same information as the statement taken in violation of Miranda. Therefore, in light of our holding, resolving the custody and public safety exception issues would be, by the State's implicit acknowledgment, an academic exercise that this court cannot afford to entertain. See, e.g. Cascade Mt. v. Capitol Indem. Corp., 212 Wis. 2d 265, 270 n.3, 569 N.W.2d 45 (Ct. App. 1997) (The time this court may devote to each case is limited.).
     
      
      In Wong Sun v. United States, 371 U.S. 471 (1963), the Supreme Court articulated the "fruit of the poisonous tree" doctrine. According to the Wong Sun majority, derivative evidence, such as physical evidence, a confession, or the testimony of a witness, is not " 'fruit of the poisonous tree' simply because it would not have come to light but for the illegal actions of the police." Id. at 488. Rather, derivative evidence must be suppressed as "fruit of the poisonous tree" if it was discovered by exploiting an illegal search. See id. Consequently, if the derivative evidence is discovered "by means sufficiently distinguishable [from the illegality] to be purged of the primary taint," id., then it is admissible. For a discussion of attenuation, see State v. Simmons, 220 Wis. 2d 775, 780-81, 585 N.W.2d 165 (Ct. App. 1998).
     
      
       The Armstrong court overruled portions of State v. Ambrosia, 208 Wis. 2d 269, 560 N.W.2d 555 (Ct. App. 1997), stating:
      
        In Ambrosia, the court of appeals concluded, based on Wong Sun, that "those portions of the post -Miranda statement tainted by the earlier statement must be suppressed." Ambrosia, 208 Wis. 2d at 277. [W]e overrule the parts of Ambrosia in which the court of appeals made the above-quoted statements, relied upon Wong Sun, or applied the Wong Sun "fruit of the poisonous tree" rationale to a statement made after a Miranda violation.
      
        State v. Armstrong, 223 Wis. 2d 331, 366-67, 588 N.W.2d 606 (1999).
     
      
       Although discussed in several cases, no Wisconsin appellate court has yet decided whether Elstad's analysis applies to derivative physical evidence. See State v. Kiekhefer, 212 Wis. 2d 460, 468-69, 569 N.W.2d 316 (Ct. App. 1997); see also State v. Harris, 199 Wis. 2d 227, 236-37 n.5, 544 N.W.2d 545 (1996).
     
      
       The defendant had given the police the name of a purported alibi witness in his unwarned statement. The witness not only failed to support Tucker's alibi, but provided additional evidence incriminating Tucker. See Michigan v. Tucker, 417 U.S. 433, 436-37 (1974).
     
      
       Several federal circuits have determined that the "tainted fruits" doctrine does not apply to physical evidence obtained as a result of a nonconstitutional Miranda violation. See, e.g., Winsett v. Washington, 130 F.3d 269 (7th Cir. 1997); 
        United States v. Elie, 111 F.3d 1135 (4th Cir. 1997); United States v. Gonzalez-Sandoval, 894 F.2d 1043, 1048 (9th Cir. 1990).
     