We consider whether the defendant’s confessions should be suppressed because, following his arrest, the police delayed his arraignment until after questioning that led to his confessions. The defendant has been charged in six indictments for breaking and entering in the nighttime and in six indictments for larceny.
A Superior Court judge suppressed the defendant’s confessions to various 1993 burglaries in Springfield principally because, after the defendant’s arrest, the police deliberately delayed the defendant’s arraignment for the purpose of obtaining incriminating statements from him. A single justice of this court allowed the Commonwealth’s application for leave to take an interlocutory appeal. In an unpublished opinion, the Appeals Court affirmed the order allowing the defendant’s motion to suppress. See 38 Mass. App. Ct. 1104 (1995). We granted the Commonwealth’s application for further appellate review.
In August, 1993, officers assigned to the Springfield police department’s burglary squad were investigating a series of burglaries that had been committed in the Forest Park section of that city. They obtained the nickname and a description of the person who had apparently committed one of the burglaries. A man meeting that description fled when a police officer sought to question him. Later, on August 25, the police saw the man again, and once again, he declined to stop for questioning and fled. This time, however, after a long pursuit, the police apprehended him between 2:30 p.m. and 3 p.m. He told the police that his name was Hector Gonzalez. A check at the police station disclosed that there were warrants outstanding for Hector Gonzalez for assault and battery and for assault and battery by means of a dangerous weapon. The defendant was arrested on the warrants and brought to the detective bureau where he was questioned as to his true identity. He was not advised of his right to use a telephone *50until about 5 P.M.1 He was booked about 5 p.m. and finally admitted that his name was Hipólito Rosario and that he used the name Hector Gonzalez as an alias. The defendant was held overnight and interviewed in the morning in the detective bureau, commencing about 9:15 a.m. He was given Miranda warnings. The judge ruled that the defendant fully understood the Miranda warnings and voluntarily and intelligently waived his Miranda rights. The judge also ruled that the defendant’s statements were voluntary and not the product of threats or coercion and were the product of a rational intellect.
Although the defendant initially denied that he had committed any burglaries, he later admitted that he had committed several. He agreed to go with the police to point out the residences that he had burglarized. He identified about six houses, all but one of which were listed in police records of places of reported burglaries. As to the exception, inquiry of the occupant disclosed that she had not reported the burglary. The police returned the defendant to the police station where, at 11:55 a.m., an officer began typing a statement which the defendant signed. The defendant was brought to court on the outstanding warrants in the afternoon.
The judge assumed that, even with prompt booking on the previous day, there would not have been time to arraign the defendant that day. On the other hand, the judge found that at 9 a.m. on the next day, the defendant could have been presented to the court from which the warrants had been issued.
The motion judge ruled that the police had violated Mass. R. Crim. P. 7 (a) (1), as amended, 397 Mass. 1226 (1986), because on August 26, the second day, they brought the defendant to the detective bureau for questioning instead of taking him to court. “I find the conclusion inescapable that [the officers] deliberately delayed presenting the defendant at the appropriate court in the hope that they could entice from him a confession of his responsibility for the series of burglaries *51that had been plaguing the Forest Park section of the city.” They knew, the judge said, that counsel would be appointed to represent the defendant at arraignment and thereafter the opportunity to obtain a statement would be greatly diminished. The motion judge allowed the defendant’s motion to suppress his oral and written statements, largely on the basis of the violation of Mass. R. Crim. P. 7 (a) (1). See note 1 above.
The Appeals Court affirmed. It concluded that the error concerning the violation of the defendant’s right to use a telephone (G. L. c. 276, § 33A [1994 ed.]) was not significant because the incriminating statements were made after the defendant was advised of his right to use a telephone. The Appeals Court further concluded, however, that the delay had been “calculated to obtain an inculpatory statement before the defendant could consult with appointed counsel.” The Appeals Court emphasized that there had been deliberate interference with the right to counsel, “egregious misconduct which is to be discouraged by strong prophylactic measures,” citing Commonwealth v. Manning, 373 Mass. 438, 443-445 (1977). The motion judge, however, did not base his ruling on the denial of any constitutional right to counsel, and the defendant has made no such argument. The defendant argues only that the deliberate police delay in arraignment violated Mass. R. Crim. P. 7 (a) (1) and requires suppression.
Rule 7 (a) (1) of the Massachusetts Rules of Criminal Procedure provides that “[a] defendant who has been arrested shall be brought before a court if then in session, and if not, at its next session.” The rule makes no distinction between a person who has been arrested pursuant to a warrant and one arrested without a warrant. The rule does not state when, during the respective sessions, an arrested defendant must be brought before a court, nor does the rule specify any consequence of noncompliance. We have said that rule 7 (a) (1) is essentially a codification of Massachusetts case law. See Commonwealth v. Hodgkins, 401 Mass. 871, 876 (1988).
The police have long had the duty to bring an arrested person before a court as soon as is reasonably possible. See Keefe v. Hart, 213 Mass. 476, 482 (1913); Tubbs v. Tukey, 3 Cush. 438, 440 (1849). The purpose of the rule is to prevent unlawful detention and to eliminate the opportunity and incentive for application of improper police pressure. See *52Commonwealth v. Perito, 417 Mass. 674, 680 (1994), citing Commonwealth v. Cote, 386 Mass. 354, 361 n.11 (1982). The reasonableness of any delay is to be determined by the circumstances. See Commonwealth v. Perito, supra at 680; Commonwealth v. Hodgkins, supra at 876-877. We have accepted rulings that an arrest made after court closed for the day, followed by an arraignment on the next day, did not involve unreasonable delay and that a confession otherwise properly obtained in the interim need not be suppressed. See Commonwealth v. Dubois, 353 Mass. 223, 226 (1967); Commonwealth v. DiStasio, 294 Mass. 273, 284 (1936). We have also accepted a trial judge’s conclusion that delay was not unreasonable when a defendant was arrested on Sunday night and not presented to court until the next Wednesday. Commonwealth v. Banuchi, 335 Mass. 649, 656 (1957). In the Banuchi opinion, the court tolerated delay caused in part by the recording of the defendant’s confession and the investigation of the defendant’s “various stories.” Id. at 657. We are not aware of any reported Massachusetts opinion in which a statement was suppressed because of unreasonable delay in arraigning a defendant.
This court has attempted to identify factors that should guide the determination of the reasonableness of any delay in arraigning a person who has been arrested. We have suggested that the same factors that should be used in determining the admissibility of a confession made following an illegal arrest should be considered in cases involving delayed arraignment. See Commonwealth v. Sylvia, 380 Mass. 180, 183-184 (1980), citing Commonwealth v. Fielding, 371 Mass. 97, 113-114 (1976). These factors are (1) whether Miranda warnings were given; (2) the circumstances, including the passage of time between the illegal arrest and the confession; and (3) the purpose and flagrancy of the official misconduct.2 Id. In the case before us the police gave Miranda warnings; the defendant’s confession was made freely, intelligently, and voluntarily; and he agreed to drive around the Forest Park section of Springfield to identify houses that he had burglarized. Apart from the intentional delay itself, there appears to have been no arguably official misconduct.
*53What happened in this case is not significantly different from what happens in any case in which police do not take a defendant to be arraigned at the earliest feasible moment, but rather, after giving Miranda warnings, interrogate the defendant and obtain a free, intelligent, and voluntary confession. In this case, the judge ruled that the police intentionally delayed arraignment in order to obtain a confession. In Commonwealth v. Fryar, 414 Mass. 732 (1993), however, the defendant, who had been arrested in the middle of the night, confessed “after the hour when overnight arrestees are usually taken to the District Court for arraignment and appointment of counsel.” Id. at 743. The defendant argued that common sense required the conclusion that the delay was a deliberate attempt by the police to interrogate the defendant without the assistance of counsel. Id. This court accepted what it called the motion judge’s implicit (and unexplained) finding that the police had not delayed the defendant’s arraignment intentionally. Id.3
The problem is that every police officer knows that an arrested person must be arraigned within a reasonable time and, when arraigned, will have a right to counsel. Any delay for the purpose of interrogation during a time when the appropriate court is in session involves a deliberate decision to delay arraignment in the sense in which the motion judge ruled in this case. The ultimate question then is whether the police should be allowed to delay arraignment in order to question a person who has been arrested.
Police, trial judges, prosecutors, and defense counsel are entitled to as clear a rule as possible concerning both the right of the police to question an arrested person and the standard for suppressing statements made by a defendant after arrest and before arraignment. Of course, if the defendant did not receive and waive his Miranda rights, or if the defendant did not make the statements freely, intelligently, and voluntarily or, if the statements were obtained before he was advised of his light to use a telephone (see G. L. c. 276, § 33A), the statements must be suppressed. Yet, as this case and our cases cited earlier indicate, trial court judges have *54different views on the reasonableness of a delay in arraignment knowingly undertaken in order to question a defendant. The reasonableness standard involves a measure of uncertainty and the likelihood of uneven application in practice.
A rule that effectively bars all police questioning of an arrestee in circumstances in which Miranda rights were voluntarily and intelligently waived and the defendant’s statements were free, intelligent, and voluntary and the product of a rational intellect is unnecessary. Certainly a voluntary, informed waiver of the right to prompt arraignment should justify the admission of subsequent statements that are otherwise admissible. See Commonwealth v. Hodgkins, 401 Mass. 871, 877 (1988) (fully informed of his rights, defendant signed waiver of prompt arraignment).
We do not favor a standard that measures the admissibility of an arrestee’s statements based on when the arrest and questioning occurred in relation to when the court is in session. It is unreasonable to have a rule that permits interrogation when the court is not in session but bars interrogation when the court is in session. Such a rule might well influence when the police would execute warrants and, if so, we would expect challenges that the police intentionally made an arrest at a time when court was not in session in order to obtain a confession before the court opened.
The Uniform Rules of Criminal Procedure, 10 U.L.A. App. (Master ed. 1987), approved by the National Conference of Commissioners on Uniform State Laws, provide that a “detained or arrested” individual must be brought before a magistrate within six hours (excluding any time between 6 p.m. and 7 a.m.), barring extraordinary circumstances. Even within the six hours, presentation may not be delayed for the purpose of questioning following a waiver of Miranda rights. See 10 U.L.A. App. Rule 311 (b) (Spec. Pamph. 1992). Thus, under rule 311 (b), if the court is in session, delay for the purposes of questioning an arrested person is forbidden. Rule 311 (b), however, inherently permits questioning that does not delay arraignment.
The American Law Institute’s Model Code of Pre-Arraignment Procedure allows a brief but identifiable period for questioning an arrested person before arraignment (or release). See Model Code of Pre-Arraignment Procedure § 140.8 (4) (Proposed Official Draft 1975). A specific but *55arbitrary time limit was adopted in order to be “consistent with the premise of the Code that police and prosecutors should be explicitly informed what they are, and are not, authorized to do, rather than being forced to await a court interpretation of what constitutes ‘unnecessary’ or ‘undue’ delay on a case-by-case basis.” Id., Commentary on § 130.2 at 334.
Decades ago, and before Miranda v. Arizona, 384 U.S. 436 (1966), the Supreme Court developed an exclusionary rule generally rendering inadmissible in a Federal criminal case a confession made during periods of detention that violated the prompt presentment requirement of Rule 5 (a) of the Federal Rules of Criminal Procedure. See McNabb v. United States, 318 U.S. 332 (1943); Mallory v. United States, 354 U.S. 449 (1957). The Court’s rule, known as the McNabb-Mallory rule and adopted in the exercise of the Court’s supervisory authority over Federal courts, excluded confessions made when a person arrested on a Federal offense was not taken “without unnecessary delay” before a magistrate as rule 5. (a) required. See United States v. Alvarez-Sanchez, 114 S. Ct. 1599, 1602 (1994). In 1968, Congress responded to the McNabb-Mallory rule by enacting 18 U.S.C. § 3501 (1968). Section 3501 (c) provides that a voluntary confession, made by a person within six hours following arrest or other detention, “shall not be inadmissible solely because of delay in bringing such person before a magistrate.” Id.4 Section 3501 (c) thus provides a safe harbor for interrogation during a six-hour period (id.), although there is disagreement among the United States Courts of Appeals as to whether the McNabb-Mallory rule still applies to confessions obtained more than six hours after an arrest on Federal charges. See United States v. Alvarez-Sanchez, supra at 1605 (Ginsberg, J., concurring).5
The Supreme Court of Pennsylvania has adopted a six-*56hour rule providing that, although a defendant’s arraignment is unnecessarily delayed, any statement, otherwise admissible, that the defendant made within six hours of arrest need not be suppressed. Commonwealth v. Duncan, 514 Pa. 395, 406 (1987). “[A] delay of six hours between arrest and arraignment is an acceptable period of time to accommodate conflicting interests without creating such a coercive effect so as to violate the rights of an accused. Therefore, the focus should be upon when the statement was obtained, i.e., within or beyond the six hour period. If the statement is obtained within the six hour period, absent coercion or other illegality, it is not obtained in violation of the rights of an accused and should be admissible. In keeping with the underlying objectives of the rule, only statements obtained after the six hour period has run should be suppressed . . . .” (Emphasis in original.) Id. A Pennsylvania appellate court has held that any purported waiver of the six-hour rule executed after the six hours has passed is not effective. Commonwealth v. Goldsmith, 422 Pa. Super. 191, 197-198 (1993).
We adopt for the future, with respect to police questioning of an arrested person, a rule similar to those in the Federal and the Pennsylvania systems discussed above. An otherwise admissible statement is not to be excluded on the ground of unreasonable delay in arraignment, if the statement is made within six hours of the arrest (day or night), or if (at any time) the defendant made an informed and voluntary written or recorded waiver of his right to be arraigned without unreasonable delay. This rule will (a) largely eliminate debate over the reasonableness of any delay, (b) bar admission of a statement made after the six-hour period unless there is a waiver of prompt arraignment, and (c) apply without regard to when either the court is in session or the arrest was made. See Commonwealth v. Davenport, 471 Pa. 278, 287-288 (1977). We will depend on the requirements of Miranda warnings, voluntariness, and the requirements of G. L. c. 276, § 33A, to protect against unfair or coercive questioning during the six hours after arrest. The six-hour period itself will place an outside limit on any incentive to question an unwilling arrestee. If, when arrested, the person is incapacitated because *57of a self-induced disability, such as by the consumption of drugs, the six-hour period should commence only when the disability terminates. Also, if for reasons not attributable to the police, such as a natural disaster or emergency, interrogation during the six-hour period is not possible or must be suspended, the six-hour period should be tolled appropriately. It is most important to recognize that, but for the exceptions just noted, the period of safe harbor questioning commences on arrest and concludes six hours later without regard to when court is in session.
We must confront the separate question whether the motion judge’s order to suppress the defendant’s statements should stand. We shall assume, as did the Appeals Court, that the motion judge’s ruling was not influenced by his erroneous view of the application of G. L. c. 276, § 33A. We agree with the defendant that this appeal does not implicate any constitutional right to counsel, as the Appeals Court appears to have thought. We have rejected the idea that all questioning of an arrested person is forbidden when the appropriate court for arraignment is in session.
The police questioning in this case, however, did not occur during the six-hour “safe harbor” period after arrest that we have adopted for the future. The defendant was held overnight and then for at least five hours while court was in session. On the other hand, the entire process of questioning concerning the burglaries, the site identification, the preparation of a written statement, and perhaps even arraignment occurred within a six-hour period. The defendant waived his Miranda rights. He freely, intelligently, and voluntarily confessed to the crimes with which he is charged. The judge found that the police did not threaten or coerce the defendant. A judicial determination of probable cause to justify the defendant’s arrest had already been made (and the arraignment occurred within twenty-four hours of the defendant’s arrest, see Jenkins v. Chief Justice of the Dist. Court Dep’t, 416 Mass. 221 [1993]). Thus one reason for the prompt arraignment rule — unlawful detention — is not involved in this case.
The questioning about criminal activity only concerned events that had no relation to the pending assault and battery charges. In this case, therefore, we need not decide whether there should be a different rule when a defendant is arrested and questioned concerning a matter as to which a judicial *58magistrate has already found probable cause and issued a warrant for the defendant’s arrest. See, however, Commonwealth v. Ortiz, post 64 (1996).
The proper disposition of this case turns on whether any police misconduct was sufficiently flagrant to require suppression as a deterrent against similar future conduct. Although the Springfield police obviously delayed arraignment to permit them to question the defendant, they had little basis to conclude that this conduct was a violation of rule 7 (a) (1). In Commonwealth v. Fryar, 414 Mass. 732, 743 (1993), less than five months before the questioning of the defendant, this court upheld the denial of a motion to suppress a statement given to the Springfield police department well after the court was open and the defendant could have been arraigned. Admittedly, in the Fryar case, there was what we called an. implied finding that there was no intentional delay in the arraignment. Id. at 743. However, the factual circumstances of the two cases (as opposed to the motion judges’ conclusions) are not so different that the police conduct in the case before us can fairly be labeled egregious or flagrant. With a new rule concerning questioning before arraignment now in place, we see no reason to apply an exclusionary rule in this case for the purpose of discouraging future improper questioning prior to arraignment. The arraignment of the defendant during the first session of the court to which he could have been brought was not so unreasonable as to require suppression of his voluntary statements given after he had received Miranda warnings.
The order of the Superior Court allowing the defendant’s motion to suppress is vacated. An order shall be entered in the Superior Court denying the defendant’s motion to suppress.
So ordered.
The motion judge concluded that this delay was a violation of G. L. c. 276, § 33A (1994 ed.), and based his ruling suppressing the defendant’s subsequent confessions in minor part on the failure to advise the defendant of his right to use a telephone. The defendant concedes that this ruling was erroneous because the defendant’s statements were not made until after he had been advised of this right. See Commonwealth v. Jones, 362 Mass. 497, 502 (1972).
The passage of time between an illegal arrest and a confession may dissipate the taint of the illegality, but it also points in the defendant’s favor when the question is whether any delay in arraignment was reasonable.
The only apparent, possibly significant, distinguishing fact between the Fryar case and the one now before us is that, in the Fryar case, the police learned at about 7:30 a.m. that the victim had died and that they were dealing with a homicide. Id.
Most States that have addressed the admissibility of a confession obtained during an unlawful prearraignment delay do not have a rule of automatic exclusion. See, e.g., People v. Kendrick, 56 Cal. 2d 71, 85 (1961); State v. Franklin, 463 A.2d 749, 753 (Me. 1983); People v. Cipriano, 431 Mich. 315, 333-334 (1988); State v. Mendacino, 288 Or. 231, 236 (1979). See also Annot., 28 A.L.R.4th 1121, 1131-1161 (1984).
The McNabb-Mallory rule is not constitutionally based. See United States v. Alvarez-Sanchez, 114 S. Ct. 1599, 1602 (1994). The defendant disavows any argument that his constitutional right to counsel, or any other constitutional right, was violated. Nor does the defendant claim a failure to comply .with the requirement of art. 14 of the Massachusetts Dec*56laration of Rights and the Fourth Amendment to the Constitution of the United States that there be a prompt determination of probable cause following a warrantless arrest. See Jenkins v. Chief Justice of the Dist. Court Dep’t, 416 Mass. 221 (1993).