Miranda warning

In the United States, the Miranda warning is a type of notification customarily given by police to criminal suspects in police custody (or in a custodial interrogation) advising them of their right to silence and, in effect, protection from self-incrimination; that is, their right to refuse to answer questions or provide information to law enforcement or other officials. Named for the U.S. Supreme Court's 1966 decision Miranda v. Arizona, these rights are often referred to as Miranda rights. The purpose of such notification is to preserve the admissibility of their statements made during custodial interrogation in later criminal proceedings. The idea came from law professor Yale Kamisar, who subsequently was dubbed "the father of Miranda."
The language used in Miranda warnings derives from the Supreme Court's opinion in its Miranda decision. But the specific language used in the warnings varies between jurisdictions, and the warning is deemed adequate as long as the defendant's rights are properly disclosed such that any waiver of those rights by the defendant is knowing, voluntary, and intelligent. For example, the warning may be phrased as follows:
The Miranda warning is part of a preventive criminal procedure rule that law enforcement are required to administer to protect an individual who is in custody and subject to direct questioning or its functional equivalent from a violation of their Fifth Amendment right against compelled self-incrimination. In Miranda v. Arizona, the Supreme Court held that the admission of an elicited incriminating statement by a suspect not informed of these rights violates the Fifth Amendment and the Sixth Amendment right to counsel, through the incorporation of these rights into state law. Thus, if law enforcement officials decline to offer a Miranda warning to an individual in their custody, they may interrogate that person and act upon the knowledge gained, but may not ordinarily use that person's statements as evidence against them in a criminal trial.
The concept of "Miranda rights" was enshrined in U.S. law following the 1966 Miranda v. Arizona Supreme Court decision, which found that the Fifth and Sixth Amendment rights of Ernesto Arturo Miranda had been violated during his arrest and trial for armed robbery, kidnapping, and rape of a young woman.
Miranda was subsequently retried and convicted, based primarily on his estranged ex-partner, who had been tracked down by the original arresting officer via Miranda's own parents, suddenly claiming that Miranda had confessed to her when she had visited him in jail. Miranda's lawyer later confessed that he 'goofed' the case by focusing too much on the constitutional issues (and losing sight of the jury and guilt or innocence).
The circumstances triggering the Miranda safeguards, i.e. Miranda rights, are "custody" and "interrogation". Custody means formal arrest or the deprivation of freedom to an extent associated with formal arrest. Interrogation means explicit questioning or actions that are reasonably likely to elicit an incriminating response. The Supreme Court did not specify the exact wording to use when informing a suspect of their rights. However, the Court did create a set of guidelines that must be followed. The ruling states:
From Miranda rights, American English developed the verb Mirandize, meaning "read the Miranda rights to".
In Berkemer v. McCarty (1984), the Supreme Court decided that a person subjected to custodial interrogation is entitled to the benefit of the procedural safeguards enunciated in Miranda, regardless of the nature or severity of the offense of which they are suspected or for which they were arrested.
Notably, the Miranda rights need not be read in any particular order, and they need not precisely match the language of the Miranda case as long as they are adequately and fully conveyed (California v. Prysock, 453 U.S. 355 (1981)).
In Berghuis v. Thompkins (2010), the Supreme Court held that unless a suspect expressly states that they are invoking this right, subsequent voluntary statements made to an officer can be used against them in court, and police can continue to interact with (or question) the alleged criminal.
In Vega v. Tekoh (2022), the Supreme Court held that police may not be sued for failing to administer Miranda warnings, and that the remedy for such a failure is the exclusion of the acquired statements at trial.
Every U.S. jurisdiction has its own regulations regarding what, precisely, must be said to a person arrested or placed in a custodial situation. The typical warning states:
The courts have since ruled that the warning must be "meaningful", so it is usually required that the suspect be asked if they understand their rights. Sometimes, firm answers of "yes" are required. Some departments and jurisdictions require that an officer ask "do you understand?" after every sentence in the warning. An arrestee's silence is not a waiver, but in Berghuis v. Thompkins (2010), the Supreme Court ruled 5–4 that police are allowed to interrogate suspects who have invoked or waived their rights ambiguously, and any statement given during questioning prior to invocation or waiving is admissible as evidence. Evidence has in some cases been ruled inadmissible because of an arrestee's poor knowledge of English and the failure of arresting officers to provide the warning in the arrestee's language.
While the exact language above is not required by Miranda, the police must advise the suspect that:
There is no precise language that must be used in advising a suspect of their Miranda rights. The point is that whatever language is used the substance of the rights outlined above must be communicated to the suspect. The suspect may be advised of their rights orally or in writing. Also, officers must make sure the suspect understands what the officer is saying, taking into account potential education levels. It may be necessary to "translate" to the suspect's level of understanding. Courts have ruled this admissible as long as the original waiver is said and the "translation" is recorded either on paper or on tape.
The Supreme Court has resisted efforts to require officers to more fully advise suspects of their rights. For example, the police are not required to advise the suspect that they can stop the interrogation at any time, that the decision to exercise the right cannot be used against the suspect, or that they have a right to talk to a lawyer before being asked any questions. Nor have the courts required to explain the rights. For example, the standard Miranda right to counsel states You have a right to have an attorney present during the questioning. Police are not required to explain that this right is not merely a right to have a lawyer present while the suspect is being questioned. The right to counsel includes:
The circumstances triggering the Miranda safeguards, i.e. Miranda warnings, are "custody" and "interrogation". Custody means formal arrest or the deprivation of freedom to an extent associated with formal arrest. Interrogation means explicit questioning or actions that are reasonably likely to elicit an incriminating response. Suspects in "custody" who are about to be interrogated must be properly advised of their Miranda rights—namely, the Fifth Amendment right against compelled self incrimination (and, in furtherance of this right, the right to counsel while in custody). The Sixth Amendment right to counsel means that the suspect has the right to consult with an attorney before questioning begins and have an attorney present during the interrogation. The Fifth Amendment right against compelled self incrimination is the right to remain silent—the right to refuse to answer questions or to otherwise communicate information.
The duty to warn only arises when police officers conduct custodial interrogations. The Constitution does not require that a defendant be advised of the Miranda rights as part of the arrest procedure, or once an officer has probable cause to arrest, or if the defendant has become a suspect of the focus of an investigation. Custody and interrogation are the events that trigger the duty to warn.
Some jurisdictions provide the right of a juvenile to remain silent if their parent or guardian is not present. Some departments in New Jersey, Nevada, Oklahoma, and Alaska modify the "providing an attorney" clause as follows:
Even though this sentence may be somewhat ambiguous to some laypersons, who can, and who have actually interpreted it as meaning that they will not get a lawyer until they confess and are arraigned in court, the U.S. Supreme Court has approved of it as an accurate description of the procedure in those states.
In Texas, New Mexico, Arizona, and California—the four states that border Mexico—suspects who are not United States citizens are given an additional warning:
After issuance of Miranda warnings, the police may ask waiver questions. Common waiver questions, which may be included on a written warning card or document, are,
An affirmative answer to both of the above questions waives the rights. If the suspect responds "no" to the first question, the officer is required to re-read the Miranda warning, while saying "no" to the second question invokes the right at that moment; in either case the interviewing officer or officers cannot question the suspect until the rights are waived.
Generally, when defendants invoke their Fifth Amendment right against self-incrimination and refuse to testify or submit to cross-examination at trial, the prosecutor cannot indirectly punish them for the exercise of a constitutional right by commenting on their silence and insinuating that it is an implicit admission of guilt. Since Miranda rights are simply a judicial gloss upon the Fifth Amendment which protects against coercive interrogations, the same rule also prevents prosecutors from commenting about the post-arrest silence of suspects who invoke their Miranda rights immediately after arrest. However, neither the Fifth Amendment nor Miranda extend to pre-arrest silence, which means that if a defendant takes the witness stand at trial (meaning he just waived his Fifth Amendment right to remain silent), the prosecutor can attack his credibility with his pre-arrest silence (based on his failure to immediately turn himself in and confess to the things he voluntarily testified about at trial).
Under the Uniform Code of Military Justice, Article 31 provides for the right against compelled self-incrimination. Interrogation subjects under Army jurisdiction must first be given Department of the Army Form 3881, which informs them of the charges and their rights, and the subjects must sign the form. The United States Navy and United States Marine Corps require that all arrested personnel be read the "rights of the accused" and must sign a form waiving those rights if they so desire; a verbal waiver is not sufficient.
It is unclear whether a Miranda warning—if spoken or in writing—could be appropriately given to disabled persons. For example, "the right to remain silent" means little to a deaf individual and the word "constitutional" may not be understood by people with only an elementary education. In one case, a deaf murder suspect was kept at a therapy station until he was able to understand the meaning of the Miranda warning and other judicial proceedings.
The Miranda rule applies to the use of testimonial evidence in criminal proceedings that is the product of custodial police interrogation. The Miranda right to counsel and right to remain silent are derived from the self-incrimination clause of the Fifth Amendment. Therefore, for the Miranda to apply, six requirements must be fulfilled:
Assuming that the six requirements are present and Miranda applies, the statement will be subject to suppression unless the prosecution can demonstrate:
The defendant may also be able to challenge the admissibility of the statement under provisions of state constitutions and state criminal procedure statutes.
Immigrants who live in the United States illegally are also protected and should receive their Miranda warnings as well when being interrogated or placed under arrest. "Aliens receive constitutional protections when they have come within the territory of the United States and [have] developed substantial connections with this country".
The Fifth Amendment right to counsel, a component of the Miranda Rule, is different from the Sixth Amendment right to counsel. In the context of the law of confessions the Sixth Amendment right to counsel is defined by the Massiah Doctrine.
Simply advising the suspect of their rights does not fully comply with the Miranda rule. The suspect must also voluntarily waive their Miranda rights before questioning can proceed. An express waiver is not necessary. However, most law enforcement agencies use written waiver forms. These include questions designed to establish that the suspect expressly waived their rights. Typical waiver questions are
and
The waiver must be "knowing and intelligent" and it must be "voluntary". These are separate requirements. To satisfy the first requirement the state must show that the suspect generally understood their rights (right to remain silent and right to counsel) and the consequences of forgoing those rights (that anything they said could be used against them in court). To show that the waiver was "voluntary" the state must show that the decision to waive the rights was not the product of police coercion. If police coercion is shown or evident, then the court proceeds to determine the voluntariness of the waiver under the totality of circumstances test focusing on the personal characteristics of the accused and the particulars of the coercive nature of the police conduct. The ultimate issue is whether the coercive police conduct was sufficient to overcome the will of a person under the totality of the circumstances. Courts traditionally focused on two categories of factors in making this determination: (1) the personal characteristics of the suspect and (2) the circumstances attendant to the waiver. However, the Supreme Court significantly altered the voluntariness standard in the case of Colorado v. Connelly. In Connelly, the Court held that "Coercive police activity is a necessary predicate to a finding that a confession is not 'voluntary' within the meaning of the Due Process Clause of the Fourteenth Amendment." The Court has applied this same standard of voluntariness in determining whether a waiver of a suspect's Fifth Amendment Miranda rights was voluntary. Thus, a waiver of Miranda rights is voluntary unless the defendant can show that their decision to waive their rights and speak to the police was the product of police misconduct and coercion that overcame the defendant's free will. After Connelly, the traditional totality of circumstances analysis is not even reached unless the defendant can first show such coercion by the police. Under Connelly, a suspect's decisions need not be the product of rational deliberations. In addition to showing that the waiver was "voluntary", the prosecution must also show that the waiver was "knowing" and "intelligent". Essentially this means the prosecution must prove that the suspect had a basic understanding of their rights and an appreciation of the consequences of forgoing those rights. The focus of the analysis is directly on the personal characteristics of the suspect. If the suspect was under the influence of alcohol or other drugs, or suffered from an emotional or mental condition that substantially impaired their capacity to make rational decisions, the courts may well decide that the suspect's waiver was not knowing and intelligent.
A waiver must also be clear and unequivocal. An equivocal statement is ineffective as a waiver and the police may not proceed with the interrogation until the suspect's intentions are made clear. The requirement that a waiver be unequivocal must be distinguished from situations in which the suspect made an equivocal assertion of their Miranda rights after the interrogation began. Any post-waiver assertion of a suspect's Miranda rights must be clear and unequivocal. Any ambiguity or equivocation will be ineffective. If the suspect's assertion is ambiguous, the interrogating officers are permitted to ask questions to clarify the suspect's intentions, although they are not required to. In other words, if a suspect's assertion is ambiguous, the police may either attempt to clarify the suspect's intentions or they may simply ignore the ineffective assertion and continue with the interrogation. The timing of the assertion is significant. Requesting an attorney prior to arrest is of no consequence because Miranda applies only to custodial interrogations. The police may simply ignore the request and continue with the questioning; however, the suspect is also free to leave.
If the defendant asserts his right to remain silent, all interrogation must immediately stop and the police may not resume the interrogation unless they have "scrupulously honored" the defendant's assertion and subsequently obtained a valid waiver before resuming the interrogation. In determining whether the police "scrupulously honored" the assertion the courts apply a totality of the circumstances test. The most important factors are the length of time between termination of the original interrogation and the commencement of the second, and issuing a new set of Miranda warnings before resumption of interrogation.
The consequences of assertion of the right to counsel are stricter. The police must immediately cease all interrogation and the police cannot reinitiate interrogation unless counsel is present (merely consulting with counsel is insufficient) or the defendant of his own volition contacts the police. If the defendant does reinitiate contact, a valid waiver must be obtained before interrogation may resume.
In Berghuis v. Thompkins (2010), the Supreme Court declared in a 5–4 decision that criminal defendants who have been read their Miranda rights (and who have indicated they understand them and have not already waived them), must explicitly state during or before an interrogation begins that they wish to be silent and not speak to police for that protection against self-incrimination to apply. If they speak to police about the incident before invoking the Miranda right to remain silent, or afterwards at any point during the interrogation or detention, the words they speak may be used against them if they have not stated they do not want to speak to police. Those who oppose the ruling contend that the requirement that the defendant must speak to indicate his intention to remain silent further erodes the ability of the defendant to stay completely silent about the case. This opposition must be put in context with the second option offered by the majority opinion, which allowed that the defendant had the option of remaining silent, saying: "Had he wanted to remain silent, he could have said nothing in response or unambiguously invoked his Miranda rights, ending the interrogation." Thus, having been "Mirandized", a suspect may avow explicitly the invocation of these rights, or, alternatively, simply remain silent. Absent the former, "anything [said] can and will be used against [the defendant] in a court of law".
Assuming that the six factors are present, the Miranda rule would apply unless the prosecution can establish that the statement falls within an exception to the Miranda rule. The three exceptions are:
Arguably only the last is a true exception—the first two can better be viewed as consistent with the Miranda factors. For example, questions that are routinely asked as part of the administrative process of arrest and custodial commitment are not considered "interrogation" under Miranda because they are not intended or likely to produce incriminating responses. Nonetheless, all three circumstances are treated as exceptions to the rule. The jail house informant exception applies to situations where the suspect does not know that he is speaking to a state-agent; either a police officer posing as a fellow inmate, a cellmate working as an agent for the state or a family member or friend who has agreed to cooperate with the state in obtaining incriminating information.
The "public safety" exception is a limited and case-specific exception, allowing certain unadvised statements (given without Miranda warnings) to be admissible into evidence at trial when they were elicited in circumstances where there was great danger to public safety; thus, the Miranda rule provides some elasticity.
The public safety exception derives from New York v. Quarles (1984), a case in which the Supreme Court considered the admissibility of a statement elicited by a police officer who apprehended a rape suspect who was thought to be carrying a firearm. The arrest took place during the middle of the night in a supermarket that was open to the public but apparently deserted except for the clerks at the checkout counter. When the officer arrested the suspect, he found an empty shoulder holster, handcuffed the suspect, and asked him where the gun was. The suspect nodded in the direction of the gun (which was near some empty cartons) and said, "The gun is over there." The Supreme Court found that such an unadvised statement was admissible in evidence because "[i]n a kaleidoscopic situation such as the one confronting these officers, where spontaneity rather than adherence to a police manual is necessarily the order of the day, the application of the exception we recognize today should not be made to depend on post hoc findings at a suppression hearing concerning the subjective motivation of the police officer." Thus, the jurisprudential rule of Miranda must yield in "a situation where concern for public safety must be paramount to adherence to the literal language of the prophylactic rules enunciated in Miranda."
Under this exception, to be admissible in the government's direct case at a trial, the questioning must not be "actually compelled by police conduct which overcame his will to resist," and must be focused and limited, involving a situation "in which police officers ask questions reasonably prompted by a concern for the public safety."
In 2010, the Federal Bureau of Investigation encouraged agents to use a broad interpretation of public safety-related questions in terrorism cases, stating that the "magnitude and complexity" of terrorist threats justified "a significantly more extensive public safety interrogation without Miranda warnings than would be permissible in an ordinary criminal case," continuing to list such examples as: "questions about possible impending or coordinated terrorist attacks; the location, nature and threat posed by weapons that might pose an imminent danger to the public; and the identities, locations, and activities or intentions of accomplices who may be plotting additional imminent attacks." A Department of Justice spokesman described this position as not altering the constitutional right, but as clarifying existing flexibility in the rule.
Prosecutors initially argued that Tsarnaev's pre-Miranda statements should be admissible under this exception. However, the exception was not considered by the court because the prosecutors later decided not to use any of that evidence in their case against Tsarnaev.
The New York Court of Appeals upheld the exception in a 2013 murder case, People v Doll, where a man with blood on his clothes was detained and questioned.
The window of opportunity for the exception is small. Once the suspect is formally charged, the Sixth Amendment right to counsel would attach and surreptitious interrogation would be prohibited. The public safety exception applies where circumstances present a clear and present danger to the public's safety and the officers have reason to believe that the suspect has information that can end the emergency.
Assuming that a Miranda violation occurred—the six factors are present and no exception applies—the statement will be subject to suppression under the Miranda exclusionary rule. That is, if the defendant objects or files a motion to suppress, the exclusionary rule would prohibit the prosecution from offering the statement as proof of guilt. However, the statement can be used to impeach the defendant's testimony. Further, the fruit of the poisonous tree doctrine does not apply to Miranda violations. Therefore, the exclusionary rule exceptions, attenuation, independent source and inevitable discovery, do not come into play, and derivative evidence would be fully admissible. For example, suppose the police continue with a custodial interrogation after the suspect has asserted his right to silence. During his post-assertion statement the suspect tells the police the location of the gun he used in the murder. Using this information the police find the gun. Forensic testing identifies the gun as the murder weapon, and fingerprints lifted from the gun match the suspect's. The contents of the Miranda-defective statement could not be offered by the prosecution as substantive evidence, but the gun itself and all related forensic evidence could be used as evidence at trial.
Although the rules vary by jurisdiction, generally a person who wishes to contest the admissibility of evidence on the grounds that it was obtained in violation of his constitutional rights must comply with the following procedural requirements:
Failure to comply with a procedural requirement may result in summary dismissal of the motion. If the defendant meets the procedural requirement, the motion will normally be considered by the judge outside the presence of the jury. The judge hears evidence, determines the facts, makes conclusions of law and enters an order allowing or denying the motion.
In addition to Miranda, confession may be challenged under the Massiah Doctrine, the voluntariness standard, provisions of federal and state rules of criminal procedure and state constitutional provisions.
The Massiah Doctrine (established by Massiah v. United States) prohibits the admission of a confession obtained in violation of the defendant's Sixth Amendment right to counsel. Specifically, the Massiah rule applies to the use of testimonial evidence in criminal proceedings deliberately elicited by the police from a defendant after formal charges have been filed. The events that trigger the Sixth Amendment safeguards under Massiah are (1) the commencement of adversarial criminal proceedings and (2) deliberate elicitation of information from the defendant by governmental agents.
The Sixth Amendment guarantees a defendant a right to counsel in all criminal prosecutions. The purposes of the Sixth Amendment right to counsel are to protect a defendant's right to a fair trial and to assure that the adversarial system of justice functions properly by providing competent counsel as an advocate for the defendant in his contest against the "prosecutorial forces" of the state.
The Sixth Amendment right "attaches" once the government has committed itself to the prosecution of the case by the initiation of adversarial judicial proceedings "by way of formal charge, preliminary hearing, indictment, information or arraignment". Determining whether a particular event or proceeding constitutes the commencement of adversarial criminal proceedings requires both an examination of the rules of criminal procedure for the jurisdiction in which the crime is charged and the Supreme Court cases dealing with the issue of when formal prosecution begins. Once adversarial criminal proceedings commence the right to counsel applies to all critical stages of the prosecution and investigation. A critical stage is "any stage of the prosecution, formal or informal, in court or out, where counsel's absence might derogate from the accused's right to a fair trial".
Government attempts to obtain incriminating statement related to the offense charged from the defendant by overt interrogation or surreptitious means is a critical stage and any information thus obtained is subject to suppression unless the government can show that an attorney was present or the defendant knowingly, voluntarily and intelligently waived his right to counsel.
Deliberate elicitation is defined as the intentional creation of circumstances by government agents that are likely to produce incriminating information from the defendant. Clearly express questioning (interrogation) would qualify but the concept also extends to surreptitious attempts to acquire information from the defendant through the use of undercover agents or paid informants.
The definition of "deliberate elicitation" is not the same as the definition of "interrogation" under the Miranda rule. Miranda interrogation includes express questioning and any actions or statements that an officer would reasonably foresee as likely to cause an incriminating response. Massiah applies to express questioning and any attempt to deliberately and intentionally obtain incriminating information from the defendant regarding the crime charged. The difference is purposeful creation of an environment likely to produce incriminating information (Massiah) and action likely to induce an incriminating response even if that was not the officer's purpose or intent (Miranda).
The Sixth Amendment right to counsel is offense-specific – the right only applies to post-commencement attempts to obtain information relating to the crime charged. The right does not extend to uncharged offenses if factually related to the charged crime.
Information obtained in violation of the defendant's Sixth Amendment right to counsel is subject to suppression unless the government can establish that the defendant waived his right to counsel. The waiver must be knowing, intelligent and voluntary. A valid Miranda waiver operates as a waiver of Sixth Amendment right.
The voluntariness standard applies to all police interrogations regardless of the custodial status of the suspect and regardless of whether the suspect has been formally charged. The remedy for a violation of the standard is complete suppression of the statement and any evidence derived from the statement. The statement cannot be used as either substantive evidence of guilt or to impeach the defendant's testimony. The reason for the strictness is the common law's aversion to the use of coerced confessions because of their inherent unreliability. Further the rights to be free from coerced confession cannot be waived nor is it necessary that the victim of coercive police conduct assert his right. In considering the voluntariness standard one must consider the Supreme Court's decision in Colorado v. Connelly. Although federal courts' application of the Connelly rule has been inconsistent and state courts have often failed to appreciate the consequences of the case, Connelly clearly marked a significant change in the application of the voluntariness standard. Before Connelly, the test was whether the confession was voluntary considering the totality of the circumstances. "Voluntary" carried its everyday meaning: the confession had to be a product of the exercise of the defendant's free will rather than police coercion. After Connelly, the totality of circumstances test is not even triggered unless the defendant can show coercive police conduct. Questions of free will and rational decision making are irrelevant to a due process claim unless police misconduct existed and a causal connection can be shown between the misconduct and the confession.
Every state constitution has articles and provision guaranteeing individual rights. In most cases the subject matter is similar to the federal bill of rights. Most state courts interpretation of their constitution is consistent with the interpretation federal court's of analogous provisions of the federal constitution. With regard to Miranda issues, state courts have exhibited significant resistance to incorporating into their state jurisprudence some of the limitations on the Miranda rule that have been created by the federal courts. As a consequence a defendant may be able to circumvent the federal limitation on the Miranda rule and successfully challenge the admissibility under state constitutional provisions. Practically every aspect of the Miranda rule has drawn state court criticism. However the primary point of contention involve the following limitations on the scope of the Miranda rule: (1) the Harris exception (2) the Burbine rule and (3) the Fare rule.
In addition to constitutionally based challenge, states permit a defendant to challenge the admissibility of a confession on the grounds that the confession was obtained in violation of a defendant's statutory rights. For example, North Carolina Criminal Procedure Act permits a defendant to move to suppress evidence obtained as a result of a "substantial" violation of the provision of the North Carolina Rules of Criminal Procedure.
Due to the prevalence of American television programs and motion pictures in which the police characters frequently read suspects their rights, it has become an expected element of arrest procedure—in the 2000 Dickerson decision, Chief Justice William Rehnquist wrote that Miranda warnings had "become embedded in routine police practice to the point where the warnings have become part of our national culture".
While arrests and interrogations can legally occur without the Miranda warning being given, this procedure would generally make the arrestee's pre-Miranda statements inadmissible at trial. (However, pursuant to the plurality opinion in United States v. Patane, physical evidence obtained as a result of pre-Miranda statements may still be admitted. There was no majority opinion of the Court in that case.)
In some jurisdictions, a detention differs at law from an arrest, and police are not required to give the Miranda warning until the person is arrested for a crime. In those situations, a person's statements made to police are generally admissible even though the person was not advised of their rights. Similarly, statements made while an arrest is in progress before the Miranda warning was given or completed are also generally admissible.
Because Miranda applies only to custodial interrogations, it does not protect detainees from standard booking questions such as name and address. Because it is a protective measure intended to safeguard the Fifth Amendment right against self-incrimination, it does not prevent the police from taking blood without a warrant from persons suspected of driving under the influence of alcohol. (Such evidence may be self-incriminatory, but are not considered statements of self-incrimination.)
If an inmate is in jail and invoked Miranda on one case, it is unclear whether this extends to any other cases that they may be charged with while in custody. For example, a subject is arrested, charged with cattle raiding, and is held in county jail awaiting trial. He invokes his Miranda rights on the cattle case. While in custody, he is involved in a fight where a staff member loses his ability to walk. He speaks to the custodial staff regarding the fight without first invoking Miranda. It is unclear if this statement is admissible because of the original Miranda statement.
Many police departments give special training to interrogators with regard to the Miranda warning; specifically, how to influence a suspect's decision to waive the right. For instance, the officer may be required to specifically ask if the rights are understood and if the suspect wishes to talk. The officer is allowed, before asking the suspect a question, to speak at length about evidence collected, witness statements, etc. The officer will then ask if the suspect wishes to talk, and the suspect is then more likely to talk in an attempt to refute the evidence presented. Another tactic commonly taught is never to ask a question; the officer may simply sit the suspect down in an interrogation room, sit across from him and do paperwork, and wait for the suspect to begin talking. These tactics are intended to mitigate the restrictions placed on law officers against compelling a suspect to give evidence, and have stood up in court as valid lawful tactics. Nevertheless, such tactics are condemned by legal rights groups as deceptive.
In Illinois v. Perkins, 496 U.S. 292 (1990), the United States Supreme Court held that undercover officers are not required to give suspects a Miranda warning prior to asking questions that may elicit incriminating responses. In this case, an undercover agent posed as an inmate and carried on a 35-minute conversation with another inmate that he suspected of committing a murder that was being investigated. During this conversation, the suspect implicated himself in the murder that the undercover agent was investigating.
The Supreme Court came to this conclusion despite the government's admission that a custodial interrogation had been conducted by a government agent.
Beginning in 2009, some detainees captured in Afghanistan have been read their Miranda rights by the FBI, according to Congressman Michael Rogers of Michigan, who claims to have witnessed this himself. According to the Justice Department, "There has been no policy change nor blanket instruction for FBI agents to Mirandize detainees overseas. While there have been specific cases in which FBI agents have Mirandized suspects overseas at both Bagram and in other situations, in order to preserve the quality of evidence obtained, there has been no overall policy change with respect to detainees."
Whether arising from their constitutions, common law, or statute, many nations recognize a defendant's right to silence.