這段說話，其實源於一件案Miranda v. Arizona, 384 U.S. 436 (1966)。
故此，法院要求執法人員向疑犯問話前，要警告疑犯：可行使「保持緘默（Right to silence）」的權利，並可要求律師陪同，如果無能力聘請律師，則可獲委派律師。
不過，要求執法人員警誡疑犯並不是新鮮事。早在1912年，英國就有一份叫《Judges’ Rules》的指引，都有類近的要求。要求執法者（或所有公權力／機關）對待疑犯時，要遵循正常（法律）程序（Due Process），當然比古代的嚴刑逼供進步得多，也體現了社會對人權日益重視、尊重。
另外一種問話技倆稱為「Bluff Technique」。問話者向疑犯謊稱已握有證據，但不明確表示究竟是可令疑犯入罪或脫罪的證據。聽起來似乎不壞，但研究發現，即使是這種看似無害的技倆，其實也很可能令無辜者「招認」。（見：Jennifer T. Perillo & Saul M. Kassin. “Inside interrogation: The lie, the bluff, and false confessions," Law and Human Behavior, Vol 35(4), Aug 2011, 327-337. doi: 10.1007/s10979-010-9244-2）
“At the outset, if a person in custody is to be subjected to interrogation, he must first be informed in clear and unequivocal terms that he has the right to remain silent. For those unaware of the privilege, the warning is needed simply to make them aware of it – the threshold requirement for an intelligent decision as to its exercise. More important, such a warning is an absolute prerequisite in overcoming the inherent pressures of the interrogation atmosphere. It is not just the subnormal or woefully ignorant who succumb to an interrogator’s imprecations, whether implied or expressly stated, that the interrogation will continue until a confession is obtained or that silence in the face of accusation is itself damning and will bode ill when presented to a jury. Further, the warning will show the individual that his interrogators are prepared to recognize his privilege should he choose to exercise it.
The Fifth Amendment privilege is so fundamental to our system of constitutional rule and the expedient of giving an adequate warning as to the availability of the privilege so simple, we will not pause to inquire in individual cases whether the defendant was aware of his rights without a warning being given. Assessments of the knowledge the defendant possessed, based on information as to his age, education, intelligence, or prior contact with authorities, can never be more than speculation; a warning is a clearcut fact. More important, whatever the background of the person interrogated, a warning at the time of the interrogation is indispensable to overcome its pressures and to insure that the individual knows he is free to exercise the privilege at that point in time.
The warning of the right to remain silent must be accompanied by the explanation that anything said can and will be used against the individual in court. This warning is needed in order to make him aware not only of the privilege, but also of the consequences of forgoing it. It is only through an awareness of these consequences that there can be any assurance of real understanding and intelligent exercise of the privilege. Moreover, this warning may serve to make the individual more acutely aware that he is faced with a phase of the adversary system – that he is not in the presence of persons acting solely in his interest.
The circumstances surrounding in-custody interrogation can operate very quickly to overbear the will of one merely made aware of his privilege by his interrogators. Therefore, the right to have counsel present at the interrogation is indispensable to the protection of the Fifth Amendment privilege under the system we delineate today. Our aim is to assure that the individual’s right to choose between silence and speech remains unfettered throughout the interrogation process. A once-stated warning, delivered by those who will conduct the interrogation, cannot itself suffice to that end among those who most require knowledge of their rights. A mere warning given by the interrogators is not alone sufficient to accomplish that end. Prosecutors themselves claim that the admonishment of the right to remain silent without more “will benefit only the recidivist and the professional." Brief for the National District Attorneys Association as amicus curiae, p. 14. Even preliminary advice given to the accused by his own attorney can be swiftly overcome by the secret interrogation process. Cf. Escobedo v. Illinois, 378 U.S. 478, 485 , n. 5. Thus, the need for counsel to protect the Fifth Amendment privilege comprehends not merely a right to consult with counsel prior to questioning, but also to have counsel present during any questioning if the defendant so desires.
The presence of counsel at the interrogation may serve several significant subsidiary functions as well. If the accused decides to talk to his interrogators, the assistance of counsel can mitigate the dangers of untrustworthiness. With a lawyer present the likelihood that the police will practice coercion is reduced, and if coercion is nevertheless exercised the lawyer can testify to it in court. The presence of a lawyer can also help to guarantee that the accused gives a fully accurate statement to the police and that the statement is rightly reported by the prosecution at trial. See Crooker v. California, 357 U.S. 433, 443 -448 (1958) (DOUGLAS, J., dissenting).
An individual need not make a pre-interrogation request for a lawyer. While such request affirmatively secures his right to have one, his failure to ask for a lawyer does not constitute a waiver. No effective waiver of the right to counsel during interrogation can be recognized unless specifically made after the warnings we here delineate have been given. The accused who does not know his rights and therefore does not make a request may be the person who most needs counsel. As the California Supreme Court has aptly put it:
“Finally, we must recognize that the imposition of the requirement for the request would discriminate against the defendant who does not know his rights. The defendant who does not ask for counsel is the very defendant who most needs counsel. We cannot penalize a defendant who, not understanding his constitutional rights, does not make the formal request and by such failure demonstrates his helplessness. To require the request would be to favor the defendant whose sophistication or status had fortuitously prompted him to make it." People v. Dorado, 62 Cal. 2d 338, 351, 398 P.2d 361, 369-370, 42 Cal. Rptr. 169, 177-178 (1965) (Tobriner, J.).
In Carnley v. Cochran, 369 U.S. 506, 513 (1962), we stated: “[I]t is settled that where the assistance of counsel is a constitutional requisite, the right to be furnished counsel does not depend on a request." This proposition applies with equal force in the context of providing counsel to protect an accused’s Fifth Amendment privilege in the face of interrogation. Although the role of counsel at trial differs from the role during interrogation, the differences are not relevant to the question whether a request is a prerequisite.
Accordingly we hold that an individual held for interrogation must be clearly informed that he has the right to consult with a lawyer and to have the lawyer with him during interrogation under the system for protecting the privilege we delineate today. As with the warnings of the right to remain silent and that anything stated can be used in evidence against him, this warning is an absolute prerequisite to interrogation. No amount of circumstantial evidence that the person may have been aware of this right will suffice to stand in its stead: Only through such a warning is there ascertainable assurance that the accused was aware of this right.
If an individual indicates that he wishes the assistance of counsel before any interrogation occurs, the authorities cannot rationally ignore or deny his request on the basis that the individual does not have or cannot afford a retained attorney. The financial ability of the individual has no relationship to the scope of the rights involved here. The privilege against self-incrimination secured by the Constitution applies to all individuals. The need for counsel in order to protect the privilege exists for the indigent as well as the affluent. In fact, were we to limit these constitutional rights to those who can retain an attorney, our decisions today would be of little significance. The cases before us as well as the vast majority of confession cases with which we have dealt in the past involve those unable to retain counsel. While authorities are not required to relieve the accused of his poverty, they have the obligation not to take advantage of indigence in the administration of justice. Denial of counsel to the indigent at the time of interrogation while allowing an attorney to those who can afford one would be no more supportable by reason or logic than the similar situation at trial and on appeal struck down in Gideon v. Wainwright, 372 U.S. 335 (1963), and Douglas v. California, 372 U.S. 353 (1963).
In order fully to apprise a person interrogated of the extent of his rights under this system then, it is necessary to warn him not only that he has the right to consult with an attorney, but also that if he is indigent a lawyer will be appointed to represent him. Without this additional warning, the admonition of the right to consult with counsel would often be understood as meaning only that he can consult with a lawyer if he has one or has the funds to obtain one. The warning of a right to counsel would be hollow if not couched in terms that would convey to the indigent – the person most often subjected to interrogation – the knowledge that he too has a right to have counsel present. As with the warnings of the right to remain silent and of the general right to counsel, only by effective and express explanation to the indigent of this right can there be assurance that he was truly in a position to exercise it.
Once warnings have been given, the subsequent procedure is clear. If the individual indicates in any manner, at any time prior to or during questioning, that he wishes to remain silent, the interrogation must cease. At this point he has shown that he intends to exercise his Fifth Amendment privilege; any statement taken after the person invokes his privilege cannot be other than the product of compulsion, subtle or otherwise. Without the right to cut off questioning, the setting of in-custody interrogation operates on the individual to overcome free choice in producing a statement after the privilege has been once invoked. If the individual states that he wants an attorney, the interrogation must cease until an attorney is present. At that time, the individual must have an opportunity to confer with the attorney and to have him present during any subsequent questioning. If the individual cannot obtain an attorney and he indicates that he wants one before speaking to police, they must respect his decision to remain silent.
This does not mean, as some have suggested, that each police station must have a “station house lawyer" present at all times to advise prisoners. It does mean, however, that if police propose to interrogate a person they must make known to him that he is entitled to a lawyer and that if he cannot afford one, a lawyer will be provided for him prior to any interrogation. If authorities conclude that they will not provide counsel during a reasonable period of time in which investigation in the field is carried out, they may refrain from doing so without violating the person’s Fifth Amendment privilege so long as they do not question him during that time."
Miranda v. Arizona, 384 U.S. 436, 467-474 (1966) (Opinion of WARREN, J.)