In The

Supreme Court of the United States




Decided February 22, 1983

Justice O’Connor, For the Court


South Dakota v. Neville, 459 U.S. 553 (1983), was a United States Supreme Court case in which the Court held that prosecutors may use a suspect's refusal to submit to a blood-alcohol test as evidence of guilt and that the introduction of such evidence at trial does not violate the suspect's Fifth Amendment privilege against self incrimination.

Topic: Criminal Procedure*Court vote: 7–0
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Holding: A suspect's refusal to submit to a blood-alcohol test may be admitted as evidence of guilt at trial.
Citation: 459 U.S. 553 Docket: 81–1453Audio: Listen to this case's oral arguments at Oyez

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JUSTICE O'CONNOR delivered the opinion of the Court.

Schmerber v. California, 384 U. S. 757 (1966), held that a State could force a defendant to submit to a blood alcohol test without violating the defendant's Fifth Amendment right against self-incrimination. We now address a question left open in Schmerber, supra, at 384 U. S. 765, n. 9, and hold that the admission into evidence of a defendant's refusal to submit to such a test likewise does not offend the right against self-incrimination.


Two Madison, South Dakota, police officers stopped respondent's car after they saw him fail to stop at a stop sign. The officers asked respondent for his driver's license and asked him to get out of the car. As he left the car, respondent staggered and fell against the car to support himself. The officers smelled alcohol on his breath. Respondent did not have a driver's license, and informed the officers that it was revoked after a previous driving-while-intoxicated conviction. The officers asked respondent to touch his finger to his nose and to walk a straight line. When respondent failed these field sobriety tests, he was placed under arrest and read his Miranda rights. [ Footnote 1 ] Respondent acknowledged that he understood his rights and agreed to talk without a lawyer present. App. 11. Reading from a printed card, the officers then asked respondent to submit to a blood alcohol test and warned him that he could lose his license if he refused. [ Footnote 2 ] Respondent refused to take the test, stating "I'm too drunk, I won't pass the test." The officers again read the request to submit to a test, and then took respondent to the police station, where they read the request to submit a third time. Respondent continued to refuse to take the test, again saying he was too drunk to pass it. [ Footnote 3 ]

South Dakota law specifically declares that refusal to submit to a blood alcohol test "may be admissible into evidence at the trial." S.D. Comp. Laws Ann. § 32-23-10.1 (Supp.1982). [ Footnote 4 ] Nevertheless, respondent sought to suppress all evidence of his refusal to take the blood alcohol test. The Circuit Court granted the suppression motion for three reasons: the South Dakota statute allowing evidence of refusal violated respondent's federal constitutional rights; the officers failed to advise respondent that the refusal could be used against him at trial; and the refusal was irrelevant to the issues before the court. The State appealed from the entire order. The South Dakota Supreme Court affirmed the suppression of the act of refusal on the grounds that § 3223-10.1, which allows the introduction of this evidence, violated the federal and state privilege against self-incrimination. [ Footnote 5 ] 312 N.W.2d 723 (1981). The court reasoned that the refusal was a communicative act involving respondent's testimonial capacities, and that the State compelled this communication by forcing respondent " to choose between submitting to a perhaps unpleasant examination and producing testimonial evidence against himself,'" id. at 726 (quoting State v. Andrews, 297 Minn. 260, 262, 212 N.W.2d 863, 864 (1973), cert. denied, 419 U.S. 881 (1974)). [ Footnote 6 ]

Since other jurisdictions have found no Fifth Amendment violation from the admission of evidence of refusal to submit to blood alcohol tests, [ Footnote 7 ] we granted certiorari to resolve the conflict. 456 U.S. 971 (1982).


The situation underlying this case -that of the drunk driver -occurs with tragic frequency on our Nation's highways. The carnage caused by drunk drivers is well documented, and needs no detailed recitation here. This Court, although not having the daily contact with the problem that the state courts have, has repeatedly lamented the tragedy. See Breithaupt v. Abram, 352 U. S. 432, 352 U. S. 439 (1957) ("The increasing slaughter on our highways, most of which should be avoidable, now reaches the astounding figures only heard of on the battlefield"); Tate v. Short, 401 U. S. 395, 401 U. S. 401 (1971) (BLACKMUN, J., concurring) (deploring "traffic irresponsibility and the frightful carnage it spews upon our highways"); Perez v. Campbell, 402 U. S. 637, 402 U. S. 657, 402 U. S. 672 (1971) (BLACKMUN, J., concurring) (footnote omitted) ("The slaughter on the highways of this Nation exceeds the death toll of all our wars"); Mackey v. Montrym, 443 U. S. 1, 443 U. S. 17 -19 (1979) (recognizing the "compelling interest in highway safety").

As part of its program to deter drinkers from driving, South Dakota has enacted an "implied consent" law. S.D. Comp. Laws Ann. § 32-23-10 (Supp.1982). This statute declares that any person operating a vehicle in South Dakota is deemed to have consented to a chemical test of the alcoholic content of his blood if arrested for driving while intoxicated. In Schmerber v. California, 384 U. S. 757 (1966), this Court upheld a state-compelled blood test against a claim that it infringed the Fifth Amendment right against self-incrimination, made applicable to the States through the Fourteenth Amendment. [ Footnote 8 ] We recognized that a coerced blood test infringed to some degree the "inviolability of the human personality" and the "requirement that the State procure the evidence against an accused by its own independent labors,'" but noted the privilege has never been given the full scope suggested by the values it helps to protect. Id. at 384 U. S. 762. We therefore held that the privilege bars the State only from compelling "communications" or "testimony." Since a blood test was "physical or real" evidence, rather than testimonial evidence, we found it unprotected by the Fifth Amendment privilege.

Schmerber, then, clearly allows a State to force a person suspected of driving while intoxicated to submit to a blood alcohol test. [ Footnote 9 ] South Dakota, however, has declined to authorize its police officers to administer a blood alcohol test against the suspect's will. Rather, to avoid violent confrontations, the South Dakota statute permits a suspect to refuse the test, and indeed requires police officers to inform the suspect of his right to refuse. S.D.Comp.Laws Ann. § 32-23-10 (Supp.1982). This permission is not without a price, however. South Dakota law authorizes the Department of Public Safety, after providing the person who has refused the test an opportunity for a hearing, to revoke for one year both the person's license to drive and any nonresident operating privileges he may possess. § 32-23-11. Such a penalty for refusing to take a blood alcohol test is unquestionably legitimate, assuming appropriate procedural protections. See Mackey v. Montrym, supra.

South Dakota further discourages the choice of refusal by allowing the refusal to be used against the defendant at trial. S.D.Comp.Laws. Ann. §§ 32-23-10.1 and 19-1328.1 (Supp.1982). Schmerber expressly reserved the question of whether evidence of refusal violated the privilege against self-incrimination. 384 U.S. at 384 U. S. 765, n. 9. The Court did indicate that general Fifth Amendment principles, rather than the particular holding of Griffin v. California, 380 U. S. 609 (1966), should control the inquiry. 384 U.S. at 384 U. S. 766, n. 9. [ Footnote 10 ]

Most courts applying general Fifth Amendment principles to the refusal to take a blood test have found no violation of the privilege against self-incrimination. Many courts, following the lead of Justice Traynor's opinion for the California Supreme Court in People v. Sudduth, 65 Cal.2d 543, 421 P.2d 401 (1966), cert. denied, 389 U.S. 850 (1967), have reasoned that refusal to submit is a physical act, rather than a communication, and for this reason is not protected by the privilege. [ Footnote 11 ] As Justice Traynor explained more fully in the companion case of People v. Ellis, 65 Cal.2d 529, 421 P.2d 393 (1966) (refusal to display voice not testimonial), evidence of refusal to take a potentially incriminating test is similar to other circumstantial evidence of consciousness of guilt, such as escape from custody and suppression of evidence. The court below, relying on Dudley v. State, 548 S.W.2d 706 (Tex.Crim.App.1977), and State v. Andrews, 297 Minn. 260, 212 N.W.2d 863 (1973), cert. denied, 419 U.S. 881 (1974), rejected this view. This minority view emphasizes that the refusal is "a tacit or overt expression and communication of defendant's thoughts," 312 N.W.2d at 726, and that the Constitution

simply forbids any compulsory revealing or communication of an accused person's thoughts or mental processes, whether it is by acts, failure to act, words spoken or failure to speak.

Dudley, supra, at 708.

While we find considerable force in the analogies to flight and suppression of evidence suggested by Justice Traynor, we decline to rest our decision on this ground. As we recognized in Schmerber, the distinction between real or physical evidence, on the one hand, and communications or testimony, on the other, is not readily drawn in many cases. 384 U.S. at 384 U. S. 764. [ Footnote 12 ] The situations arising from a refusal present a difficult gradation from a person who indicates refusal by complete inaction, to one who nods his head negatively, to one who states "I refuse to take the test," to the respondent here, who stated "I'm too drunk, I won't pass the test." Since no impermissible coercion is involved when the suspect refuses to submit to take the test, regardless of the form of refusal, we prefer to rest our decision on this ground, and draw possible distinctions when necessary for decision in other circumstances. [ Footnote 13 ]

As we stated in Fisher v. United States, 425 U. S. 391, 425 U. S. 397 (1976),

[t]he Court has held repeatedly that the Fifth Amendment is limited to prohibiting the use of 'physical or moral compulsion' exerted on the person asserting the privilege.

This coercion requirement comes directly from the constitutional language directing that no person "shall be compelled in any criminal case to be a witness against himself." U.S.Const., Amdt. 5 (emphasis added). And as Professor Levy concluded in his history of the privilege,

[t]he element of compulsion or involuntariness was always an ingredient of the right and, before the right existed, of protests against incriminating interrogatories.

L. Levy, Origins of the Fifth Amendment 328 (1968).

Here, the State did not directly compel respondent to refuse the test, for it gave him the choice of submitting to the test or refusing. Of course, the fact the government gives a defendant or suspect a "choice" does not always resolve the compulsion inquiry. The classic Fifth Amendment violation -telling a defendant at trial to testify -does not, under an extreme view, compel the defendant to incriminate himself. He could submit to self-accusation, or testify falsely (risking perjury) or decline to testify (risking contempt). But the Court has long recognized that the Fifth Amendment prevents the State from forcing the choice of this "cruel trilemma" on the defendant. See Murphy v. Waterfront Comm'n, 378 U. S. 52, 378 U. S. 55 (1964). See also New Jersey v. Portash, 440 U. S. 450, 440 U. S. 459 (1979) (telling a witness under a grant of legislative immunity to testify or face contempt sanctions is "the essence of coerced testimony"). Similarly, Schmerber cautioned that the Fifth Amendment may bar the use of testimony obtained when the proffered alternative was to submit to a test so painful, dangerous, or severe, or so violative of religious beliefs, that almost inevitably a person would prefer "confession." 384 U.S. at 384 U. S. 765, n. 9. [ Footnote 14 ] Cf. Miranda v. Arizona, 384 U. S. 436, 384 U. S. 458 (1966) (unless compulsion inherent in custodial surroundings is dispelled, no statement is truly a product of free choice).

In contrast to these prohibited choices, the values behind the Fifth Amendment are not hindered when the State offers a suspect the choice of submitting to the blood alcohol test or having his refusal used against him. The simple blood alcohol test is so safe, painless, and commonplace, see Schmerber, 384 U.S. at 384 U. S. 771, that respondent concedes, as he must, that the State could legitimately compel the suspect, against his will, to accede to the test. Given, then, that the offer of taking a blood alcohol test is clearly legitimate, the action becomes no less legitimate when the State offers a second option of refusing the test, with the attendant penalties for making that choice. Nor is this a case where the State has subtly coerced respondent into choosing the option it had no right to compel, rather than offering a true choice. To the contrary, the State wants respondent to choose to take the test, for the inference of intoxication arising from a positive blood alcohol test is far stronger than that arising from a refusal to take the test.

We recognize, of course, that the choice to submit or refuse to take a blood alcohol test will not be an easy or pleasant one for a suspect to make. But the criminal process often requires suspects and defendants to make difficult choices. See, e.g., Crampton v. Ohio, decided with McGautha v. California, 402 U. S. 183, 402 U. S. 213 -217 (1971). We hold, therefore, that a refusal to take a blood alcohol test, after a police officer has lawfully requested it, is not an act coerced by the officer, and thus is not protected by the privilege against self-incrimination. [ Footnote 15 ]


Relying on Doyle v. Ohio, 426 U. S. 610 (1976), respondent also suggests that admission at trial of his refusal violates the Due Process Clause because respondent was not fully warned of the consequences of refusal. Doyle held that the Due Process Clause prohibits a prosecutor from using a defendant's silence after Miranda warnings to impeach his testimony at trial. Just a Term before, in United States v. Hale, 422 U. S. 171 (1975), we had determined under our supervisory power that the federal courts could not use such silence for impeachment because of its dubious probative value. Although Doyle mentioned this rationale in applying the rule to the States, 426 U.S. at 426 U. S. 617, the Court relied on the fundamental unfairness of implicitly assuring a suspect that his silence will not be used against him and then using his silence to impeach an explanation subsequently offered at trial. Id. at 426 U. S. 618.

Unlike the situation in Doyle, we do not think it fundamentally unfair for South Dakota to use the refusal to take the test as evidence of guilt, even though respondent was not specifically warned that his refusal could be used against him at trial. First, the right to silence underlying the Miranda warnings is one of constitutional dimension, and thus cannot be unduly burdened. See Miranda, supra, at 384 U. S. 468, n. 37. Cf. Fletcher v. Weir, 455 U. S. 603 (1982) (post-arrest silence without Miranda warnings may be used to impeach trial testimony). Respondent's right to refuse the blood alcohol test, by contrast, is simply a matter of grace bestowed by the South Dakota Legislature.

Moreover, the Miranda warnings emphasize the dangers of choosing to speak ("whatever you say can and will be used as evidence against you in court"), but give no warning of adverse consequences from choosing to remain silent. This imbalance in the delivery of Miranda warnings, we recognized in Doyle, implicitly assures the suspect that his silence will not be used against him. The warnings challenged here, by contrast, contained no such misleading implicit assurances as to the relative consequences of his choice. The officers explained that, if respondent chose to submit to the test, he had the right to know the results, and could choose to take an additional test by a person chosen by him. The officers did not specifically warn respondent that the test results could be used against him at trial. [ Footnote 16 ] Explaining the consequences of the other option, the officers specifically warned respondent that failure to take the test could lead to loss of driving privileges for one year. It is true the officers did not inform respondent of the further consequence that evidence of refusal could be used against him in court, [ Footnote 17 ] but we think it unrealistic to say that the warnings given here implicitly assure a suspect that no consequences other than those mentioned will occur. Importantly, the warning that he could lose his driver's license made it clear that refusing the test was not a "safe harbor," free of adverse consequences.

While the State did not actually warn respondent that the test results could be used against him, we hold that such a failure to warn was not the sort of implicit promise to forgo use of evidence that would unfairly "trick" respondent if the evidence were later offered against him at trial. We therefore conclude that the use of evidence of refusal after these warnings comported with the fundamental fairness required by due process.


The judgment of the South Dakota Supreme Court is reversed, and the case is remanded for further proceedings not inconsistent with this opinion.

It is so ordered.


[ Footnote 1 ]

The officer read the Miranda warning from a printed card. He read:

You have the right to remain silent. You don't have to talk to me unless you want to do so. If you want to talk to me, I must advise you whatever you say can and will be used as evidence against you in court. You have the right to confer with a lawyer, and to have a lawyer present with you while you're being questioned. If you want a lawyer but are unable to pay for one, a lawyer will be appointed to represent you free of any cost to you. Knowing these rights, do you want to talk to me without having a lawyer present? You may stop talking to me at any time. You may also demand a lawyer at any time.

App. 8. See Miranda v. Arizona, 384 U. S. 436, 384 U. S. 467 -473 (1966).

[ Footnote 2 ]

The card read:

I have arrested you for driving or being in actual physical control of a vehicle while under the influence of alcohol or drugs, a violation of S.D.C. L. 32-23-1. I request that you submit to a chemical test of your blood to determine your blood alcohol concentration. You have the right to refuse to submit to such a test, and if you do refuse, no test will be given. You have the right to a chemical test by a person of your own choosing at your own expense in addition to the test I have requested. You have the right to know the results of any chemical test. If you refuse the test I have requested, your driver's license and any nonresidence driving privilege may be revoked for one year after an opportunity to appear before a hearing officer to determine if your driver's license or nonresidence driving privilege shall be revoked. If your driver's license or nonresidence driving privileges are revoked by the hearing officer, you have the right to appeal to Circuit Court. Do you understand what I told you? Do you wish to submit to the chemical test I have requested?

App. 8-10.

[ Footnote 3 ]

Responding to other questions, respondent informed the officers that he had been drinking "close to one case" by himself at home, and that his last drink was "about ten minutes ago." Tr. of Preliminary Hearing 8.

[ Footnote 4 ]

South Dakota Comp.Laws Ann. § 19-13-28.1 (Supp.1982) likewise declares that, notwithstanding the general rule in South Dakota that the claim of a privilege is not a proper subject of comment by judge or counsel, evidence of refusal to submit to a chemical analysis of blood, urine, breath, or other bodily substance "is admissible into evidence" at a trial for driving under the influence of alcohol. A person "may not claim privilege against self-incrimination with regard to admission of refusal to submit to chemical analysis." Ibid.

[ Footnote 5 ]

As JUSTICE STEVENS emphasizes, post at 459 U. S. 567, the South Dakota Supreme Court clearly held that the statute violated the State, as well as Federal, Constitution. Although this would be an adequate state ground for decision, we do not read the opinion as resting on an independent state ground. Rather, we think the court determined that admission of this evidence violated the Fifth Amendment privilege against self-incrimination, and then concluded without further analysis that the state privilege was violated as well. In reaching its holding, the court first analyzed our decisions in Schmerber v. California, 384 U. S. 757 (1966), and Miranda v. Arizona, supra. The court then described the issue for its review as being "[t]o determine whether the Fifth Amendment privilege against self-incrimination applies to refusal evidence," 312 N.W.2d 723, 725 (1981) (emphasis added), and later asked "whether this testimonial evidence was compelled for purposes of applying the Fifth Amendment standard, " id. at 726 (emphasis added). The cases relied on by the court to resolve these issues analyze the federal privilege against self-incrimination.

The analysis of the court below was remarkably similar to that of the state court opinion reviewed in Delaware v. Prouse, 440 U. S. 648, 440 U. S. 651 -653 (1979). That state court opinion analyzed various decisions interpreting the Federal Constitution, concluded that the Fourth Amendment violated the police procedure at issue there, and then summarily held that the State Constitution was therefore also infringed. As we characterized their analysis, every police practice found to violate the Fourth Amendment would, without further analysis, be held to be contrary to the State Constitution as well. In such a situation, we concluded, this Court has jurisdiction to review the federal constitutional issue decided below.

JUSTICE STEVENS, while expressing general dissatisfaction with Prouse, attempts to distinguish it by noting that the state court there had said the State and Federal Constitutions are " substantially similar' and that `a violation of the latter is necessarily a violation of the former.'" Post at 459 U. S. 571, n. 7. But the South Dakota Supreme Court made virtually identical statements. In a footnote, the court recognized the textual difference between the federal and state constitutional privileges against self-incrimination, but noted that this Court, in Schmerber, had interpreted the Fifth Amendment prohibition "in light of the more liberal definition of `evidence' as used in our state constitution." 312 N.W.2d at 726, n. Therefore, the court concluded,

[s]ince the Fifth Amendment of the U.S. Constitution is broad enough to exclude this evidence, there is no need to draw a distinction at this time between S.D. Const. Art. VI, § 9 and the Fifth Amendment of the U.S. Constitution.

Ibid. The court could not have stated more clearly that it simply assumed that any violation of the Fifth Amendment privilege also violated, without further analysis, the state privilege. This was precisely the reasoning we found sufficient in Prouse to give us jurisdiction to hear the case and decide the federal constitutional issue.

[ Footnote 6 ]

The South Dakota Supreme Court also remanded for a determination whether respondent's statement that he was too drunk to pass the test was made after a voluntary waiver of his right to remain silent. As yet, of course, there has been no final judgment in this case. This Court nevertheless has jurisdiction under 28 U.S.C. § 1257(3) to review the federal constitutional issue which has been finally determined, because if the State ultimately prevails at trial, the federal issue will be mooted; and if the State loses at trial, governing state law, S.D.Comp.Laws Ann. §§ 23A-32-4 and 23A-32-5 (1979), prevents it from again presenting the federal claim for review. See California v. Stewart (decided with Miranda v. Arizona, 384 U. S. 436, 384 U. S. 498, n. 71 (1966)); Cox Broadcasting Corp. v. Cohn, 420 U. S. 469, 420 U. S. 481 (1975).

[ Footnote 7 ]

See, e.g., cases cited in nn. 11 and | 11 and S. 553fn13|>13, infra.

[ Footnote 8 ]

Schmerber also rejected arguments that the coerced blood test violated the right to due process, the right to counsel, and the prohibition against unreasonable searches and seizures.

[ Footnote 9 ]

Schmerber did caution that due process concerns could be involved if the police initiated physical violence while administering the test, refused to respect a reasonable request to undergo a different form of testing, or responded to resistance with inappropriate force. 384 U.S. at 384 U. S. 760, n. 4.

[ Footnote 10 ]

Griffin held that a prosecutor's or trial court's comments on a defendant's refusal to take the witness stand impermissibly burdened the defendant's Fifth Amendment right to refuse. Unlike the defendant's situation in Griffin, a person suspected of drunk driving has no constitutional right to refuse to take a blood alcohol test. The specific rule of Griffin is thus inapplicable.

[ Footnote 11 ]

See, e.g., Newhouse v. Misterly, 415 F.2d 514 (CA9 1969); Hill v. State, 366 So.2d 318, 324-325 (Ala.1979); Campbell v. Superior Court, 106 Ariz. 542, 479 P.2d 685 (1971); State v. Haze, 218 Kan. 60, 542 P.2d 720 (1975) (refusal to give handwriting exemplar); City of Westerville v. Cunningham, 15 Ohio St.2d 121, 239 N.E.2d 40 (1968).

[ Footnote 12 ]

The Court in Schmerber pointed to the lie detector test as an example of evidence that is difficult to characterize as testimonial or real. Even though the test may seek to obtain physical evidence, we reasoned that to compel a person to submit to such testing "is to evoke the spirit and history of the Fifth Amendment." 384 U.S. at 384 U. S. 764. See also People v. Ellis, 65 Cal.2d 529, 537, and n. 9, 421 P.2d 393, 397, and n. 9 (1966) (analyzing lie detector tests as within the Fifth Amendment privilege). A second example of seemingly physical evidence that nevertheless invokes Fifth Amendment protection was presented in Estelle v. Smith, 451 U. S. 454 (1981). There, we held that the Fifth Amendment privilege protected compelled disclosures during a court-ordered psychiatric examination. We specifically rejected the claim that the psychiatrist was observing the patient's communications simply to infer facts of his mind, rather than to examine the truth of the patient's statements.

[ Footnote 13 ]

Many courts have found no self-incrimination problem on the ground of no coercion, or on the analytically related ground that the State, if it can compel submission to the test, can qualify the right to refuse the test. See, e.g., Welch v. District Court, 594 F.2d 903 (CA2 1979); State v. Meints, 189 Neb. 264, 202 N.W.2d 202 (1972); State v. Gardner, 52 Ore.App. 663, 629 P.2d 412 (1981); State v. Brean, 136 Vt. 147, 385 A.2d 1085 (1978).

[ Footnote 14 ]

Nothing in the record suggests that respondent made or could sustain such a claim in this case.

[ Footnote 15 ]

In the context of an arrest for driving while intoxicated, a police inquiry of whether the suspect will take a blood alcohol test is not an interrogation within the meaning of Miranda. As we stated in Rhode Island v. Innis, 446 U. S. 291, 446 U. S. 301 (1980), police words or actions "normally attendant to arrest and custody" do not constitute interrogation. The police inquiry here is highly regulated by state law, and is presented in virtually the same words to all suspects. It is similar to a police request to submit to fingerprinting or photography. Respondent's choice of refusal thus enjoys no prophylactic Miranda protection outside the basic Fifth Amendment protection. See generally Arenella, Schmerber and the Privilege Against Self-Incrimination: A Reappraisal, 20 Am.Crim.L.Rev. 31, 56-58 (1982).

[ Footnote 16 ]

Even though the officers did not specifically advise respondent that the test results could be used against him in court, no one would seriously contend that this failure to warn would make the test results inadmissible had respondent chosen to submit to the test. Cf. Schneckloth v. Bustamonte, 412 U. S. 218 (1973) (knowledge of right to refuse not an essential part of proving effective consent to a search).

[ Footnote 17 ]

Since the State wants the suspect to submit to the test, it is in its interest fully to warn suspects of the consequences of refusal. We are informed that police officers in South Dakota now warn suspects that evidence of their refusal can be used against them in court. Tr. of Oral Arg. 16.

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