[302]*302Mr. Justice Brennan
delivered the opinion of the Court.
Petitioner, William Miller, together with Bessie Byrd and her brother, Arthur R. Shepherd, was tried and convicted in the District Court for the District of Columbia for conspiracy to commit violations, and violations, of the federal narcotics laws. 26 U. S. C. (Supp. V) § 4704 (a), 21 U. S. C. § 174, 18 U. S. C. § 371. The Court of Appeals for the District of Columbia Circuit affirmed, one judge dissenting, 100 U. S. App. D. C. 302, 244 F. 2d 750. We granted certiorari, 353 U. S. 957, to determine whether evidence seized at the time of petitioner’s arrest was properly admitted against the petitioner. The evidence was $100 of marked currency which was seized by the federal officers who arrested the petitioner and Bessie Byrd at their apartment.
On March 25, 1955, at 1:35 a. m., Clifford Reed was arrested, under an arrest warrant, on a Washington, D. C., street on suspicion of narcotics offenses. Reed revealed to Wilson, a federal narcotics agent, that he purchased heroin in 100-capsule quantities from the petitioner through Shepherd. Agent Wilson knew of the petitioner as one who had trafficked in narcotics and had been convicted for a narcotics offense in 1953. Reed said that he was to meet Shepherd later that morning to make a purchase. Agent Wilson enlisted his aid to apprehend Shepherd and the petitioner. About 3 a. m. another federal narcotics agent, Lewis, carrying $100 of marked currency, went with Reed in a taxicab to Shepherd’s home. Reed introduced Lewis to Shepherd as a buyer. Shepherd accepted the $100 and agreed to secure 100 capsules of heroin from the petitioner and deliver them to Lewis at Reed’s apartment. Shepherd proceeded alone in the taxicab to the petitioner’s apartment.
[303]*303The taxicab was followed by agent Wilson, officer Wurms of the Metropolitan Police Department, and other officers in police cars.1 Shepherd was seen to leave the taxicab in front of the apartment house where the petitioner and Bessie Byrd occupied a two-room-and-bath basement apartment. The taxicab waited. Shepherd entered the basement but agent Wilson, who looked into the basement hall, could not see where he went. Shepherd came out of the basement within a few minutes and re-entered the taxicab. The taxicab was proceeding toward Reed's apartment when the officers following in the police cars intercepted it. Shepherd was arrested and searched. He did not have the marked bills on his person but admitted to agent Wilson and officer Wurms that a package of 100 capsules of narcotics found under the taxicab’s front seat was put there by him when the police cars stopped the taxicab. He said that he had taken the package from behind a fire extinguisher in the basement hall where he had been sent by a “féllow” with Reed who had promised him $10 for getting'it.
The federal officers returned immediately to the apartment building. About 3:45 a. m. agent Wilson and officer Wurms went to the door of the petitioner’s apartment. Officer Wurms knocked and, upon the inquiry from within — “Who’s there?” — replied in a low voice, “Police.” The petitioner opened the door on an attached door chain and asked what the officers were doing there. Before either responded, he attempted to close the door. Thereupon, according to officer Wurms, “we put our hands inside the door and pulled and ripped the chain off, [304]*304and entered.” 2 The officers had no arrest or search warrant. They did not expressly demand admission or state their purpose for their presence,3 nor did they place the petitioner under arrest until after they entered the apartment.
Bessie Byrd was also arrested in the apartment and turned over the cash she had in her housecoat. The cash included $34 of the marked currency. After an extended search the remaining $66 of marked currency was found, some in a hatbox in a closet, and the rest within the covers of a bed in the bedroom.
The Government contends that there was probable cause for arresting the petitioner and that the marked cur[305]*305rency was properly admitted in evidence because it was seized as an incident to a lawful arrest. Harris v. United States, 331 U. S. 145. The petitioner’s argument breaks down into three contentions: (1) that the officers had no probable cause to arrest the petitioner without a warrant; (2) that the search was not justified as being an incident of a lawful arrest; (3) that the arrest, and therefore the search, was in any event unlawful because the officers broke the door of petitioner’s home without first giving notice of their authority and purpose in demanding admission. If any one of these contentions prevails, it is agreed that the marked money was inadmissible in evidence. In the view we take, we need consider only petitioner’s third contention.
The lawfulness of the arrest of petitioner depends upon the power of the arresting officers to “break” the doors of a home in order to arrest without warrant persons suspected of having committed narcotics offenses. Agent Wilson did not have statutory authority to arrest without a warrant although officer Wurms, as a member of the Metropolitan Police Department, did have such authority.4 This Court has said, in the similar circumstance of an arrest for violation of federal law by state peace officers, that the lawfulness of the arrest without warrant is to be determined by reference to state law. United States v. Di Re, 332 U. S. 581, 589; Johnson v. United States, 333 U. S. 10, 15. By like reasoning the validity of the arrest [306]*306of petitioner is to be determined by reference to the law of the District of Columbia.
In making reference to that law we are mindful of our policy of not interfering with local rules of law fashioned by the courts of the District of Columbia. Fisher v. United States, 328 U. S. 463, 476; Griffin v. United States, 336 U. S. 704, 715. But the Government agrees with petitioner that the validity of the entry to execute the arrest without warrant must be tested by criteria identical with those embodied in 18 U. S. C. § 3109, which deals with entry to execute a search warrant.5 That section provides that an officer, executing a search warrant, may break open a door only if, “after notice of his authority and purpose,” he is denied admittance. The Government states in its brief that, “where an arrest is made on probable cause rather than a warrant, these statutory requirements must be met before an officer can force entry into an apartment.” These statutory requirements are substantially identical to those judicially developed by the Court of Appeals for the District of Columbia Circuit in Accarino v.
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[302]*302Mr. Justice Brennan
delivered the opinion of the Court.
Petitioner, William Miller, together with Bessie Byrd and her brother, Arthur R. Shepherd, was tried and convicted in the District Court for the District of Columbia for conspiracy to commit violations, and violations, of the federal narcotics laws. 26 U. S. C. (Supp. V) § 4704 (a), 21 U. S. C. § 174, 18 U. S. C. § 371. The Court of Appeals for the District of Columbia Circuit affirmed, one judge dissenting, 100 U. S. App. D. C. 302, 244 F. 2d 750. We granted certiorari, 353 U. S. 957, to determine whether evidence seized at the time of petitioner’s arrest was properly admitted against the petitioner. The evidence was $100 of marked currency which was seized by the federal officers who arrested the petitioner and Bessie Byrd at their apartment.
On March 25, 1955, at 1:35 a. m., Clifford Reed was arrested, under an arrest warrant, on a Washington, D. C., street on suspicion of narcotics offenses. Reed revealed to Wilson, a federal narcotics agent, that he purchased heroin in 100-capsule quantities from the petitioner through Shepherd. Agent Wilson knew of the petitioner as one who had trafficked in narcotics and had been convicted for a narcotics offense in 1953. Reed said that he was to meet Shepherd later that morning to make a purchase. Agent Wilson enlisted his aid to apprehend Shepherd and the petitioner. About 3 a. m. another federal narcotics agent, Lewis, carrying $100 of marked currency, went with Reed in a taxicab to Shepherd’s home. Reed introduced Lewis to Shepherd as a buyer. Shepherd accepted the $100 and agreed to secure 100 capsules of heroin from the petitioner and deliver them to Lewis at Reed’s apartment. Shepherd proceeded alone in the taxicab to the petitioner’s apartment.
[303]*303The taxicab was followed by agent Wilson, officer Wurms of the Metropolitan Police Department, and other officers in police cars.1 Shepherd was seen to leave the taxicab in front of the apartment house where the petitioner and Bessie Byrd occupied a two-room-and-bath basement apartment. The taxicab waited. Shepherd entered the basement but agent Wilson, who looked into the basement hall, could not see where he went. Shepherd came out of the basement within a few minutes and re-entered the taxicab. The taxicab was proceeding toward Reed's apartment when the officers following in the police cars intercepted it. Shepherd was arrested and searched. He did not have the marked bills on his person but admitted to agent Wilson and officer Wurms that a package of 100 capsules of narcotics found under the taxicab’s front seat was put there by him when the police cars stopped the taxicab. He said that he had taken the package from behind a fire extinguisher in the basement hall where he had been sent by a “féllow” with Reed who had promised him $10 for getting'it.
The federal officers returned immediately to the apartment building. About 3:45 a. m. agent Wilson and officer Wurms went to the door of the petitioner’s apartment. Officer Wurms knocked and, upon the inquiry from within — “Who’s there?” — replied in a low voice, “Police.” The petitioner opened the door on an attached door chain and asked what the officers were doing there. Before either responded, he attempted to close the door. Thereupon, according to officer Wurms, “we put our hands inside the door and pulled and ripped the chain off, [304]*304and entered.” 2 The officers had no arrest or search warrant. They did not expressly demand admission or state their purpose for their presence,3 nor did they place the petitioner under arrest until after they entered the apartment.
Bessie Byrd was also arrested in the apartment and turned over the cash she had in her housecoat. The cash included $34 of the marked currency. After an extended search the remaining $66 of marked currency was found, some in a hatbox in a closet, and the rest within the covers of a bed in the bedroom.
The Government contends that there was probable cause for arresting the petitioner and that the marked cur[305]*305rency was properly admitted in evidence because it was seized as an incident to a lawful arrest. Harris v. United States, 331 U. S. 145. The petitioner’s argument breaks down into three contentions: (1) that the officers had no probable cause to arrest the petitioner without a warrant; (2) that the search was not justified as being an incident of a lawful arrest; (3) that the arrest, and therefore the search, was in any event unlawful because the officers broke the door of petitioner’s home without first giving notice of their authority and purpose in demanding admission. If any one of these contentions prevails, it is agreed that the marked money was inadmissible in evidence. In the view we take, we need consider only petitioner’s third contention.
The lawfulness of the arrest of petitioner depends upon the power of the arresting officers to “break” the doors of a home in order to arrest without warrant persons suspected of having committed narcotics offenses. Agent Wilson did not have statutory authority to arrest without a warrant although officer Wurms, as a member of the Metropolitan Police Department, did have such authority.4 This Court has said, in the similar circumstance of an arrest for violation of federal law by state peace officers, that the lawfulness of the arrest without warrant is to be determined by reference to state law. United States v. Di Re, 332 U. S. 581, 589; Johnson v. United States, 333 U. S. 10, 15. By like reasoning the validity of the arrest [306]*306of petitioner is to be determined by reference to the law of the District of Columbia.
In making reference to that law we are mindful of our policy of not interfering with local rules of law fashioned by the courts of the District of Columbia. Fisher v. United States, 328 U. S. 463, 476; Griffin v. United States, 336 U. S. 704, 715. But the Government agrees with petitioner that the validity of the entry to execute the arrest without warrant must be tested by criteria identical with those embodied in 18 U. S. C. § 3109, which deals with entry to execute a search warrant.5 That section provides that an officer, executing a search warrant, may break open a door only if, “after notice of his authority and purpose,” he is denied admittance. The Government states in its brief that, “where an arrest is made on probable cause rather than a warrant, these statutory requirements must be met before an officer can force entry into an apartment.” These statutory requirements are substantially identical to those judicially developed by the Court of Appeals for the District of Columbia Circuit in Accarino v. United States, 85 U. S. App. D. C. 394, 403, 179 F. 2d 456, 465. Since the rule of Accarino bears such a close relationship to a statute which is not confined in operation to the District of Columbia, we believe that review is warranted here. Cf. Del Vecchio v. Bowers, 296 U. S. 280; Carroll v. United States, 354 U. S. 394, 414.
From earliest days, the common law drastically limited the authority of law officers to break the door of a house [307]*307to effect an arrest.6 Such action invades the precious interest of privacy summed up in the ancient adage that a man’s house is his castle. As early as the 13th Yearbook of Edward IY (1461-1483), at folio 9, there is a recorded holding that it was unlawful for the sheriff to break the doors of a man’s house to arrest him in a civil suit in debt or trespass, for the arrest was then only for the private interest of a party. Remarks attributed7 to William Pitt, Earl of Chatham, on the occasion of debate in Parliament on the searches incident to the enforcement of an excise on cider, eloquently expressed the principle:
“The poorest man may in his cottage bid defiance to all the forces of the Crown. It may be frail; its roof may shake; the wind may blow through it; the storm may enter; the rain may enter; but the King of England cannot enter — all his force dares not cross the threshold of the ruined tenement!”
But the common law recognized some authority in law officers to break the door of a dwelling to arrest for felony. The common-law authorities differ, however, as to the circumstances in which this was the case. Hawkins says: “where one lies under a probable Suspicion only, and is not indicted, it seems the better Opinion at this Day, That no one can justify the Breaking open Doors in Order to [308]*308apprehend him.” 2 Hawkins, Pleas of the Crown (1762), c. 14, § 7; see also Foster, Crown Law (1762), 320-321. Coke appears to have been of the same view, and to have thought that the breaking of a house was limited to cases in which a writ, now our warrant, had issued. Co. 4th Inst. 177. On the other hand, Hale says that “A man, that arrests upon suspicion of felony, may break open doors, if the party refuse upon demand to open them . . . .” 1 Hale, Pleas of the Crown (1736), 583.
Whatever the circumstances under which breaking a door to arrest for felony might be lawful, however, the breaking was unlawful where the officer failed first to state his authority and purpose for demanding admission. The requirement was pronounced in 1603 in Semayne’s Case, 5 Co. Rep. 91a, 11 E. R. C. 629, 77 Eng. Repr. 194, at 195: “In all cases where the King is party, the sheriff (if the doors be not open) may break the party’s house, either to arrest him, or to do other execution of the K[ing]’s process, if otherwise he cannot enter. But before he breaks it, he ought to signify the cause of his coming, and to make request to open doors . . . (Emphasis supplied.)
The requirement stated in Semayne’s Case still obtains. It is reflected in 18 U. S. C. § 3109, in the statutes of a large number of States,8 and in the American Law [309]*309Institute’s proposed Code of Criminal Procedure, § 28.9 It applies, as the Government here concedes, whether the arrest is to be made by virtue of a warrant, or when officers are authorized to make an arrest for a felony* without a warrant. There are some state decisions holding that justification for noncompliance exists in exigent circumstances, as, for example, when the officers may in good faith believe that they or someone within are in peril of bodily harm, Read v. Case, 4 Conn. 166, or that the person to be arrested is fleeing or attempting to destroy evidence. People v. Maddox, 46 Cal. 2d 301, 294 P. 2d 6.
But whether the unqualified requirements of the rule admit of an exception justifying noncompliance in exigent circumstances is not a question we are called upon to decide in this case. The Government makes no claim here of the existence of circumstances excusing compliance. The Government concedes that compliance was required but argues that “compliance is evident from the events immediately preceding the officers’ forced entry.”
The rule seems to require notice in the form of an express announcement by the officers of their purpose for demanding admission. The burden of making an express announcement is certainly slight. A few more words by [310]*310the officers would have satisfied the requirement in this case. It may be that, without an express announcement of purpose, the facts known to officers would justify them in being virtually certain that the petitioner already knows their purpose so that an announcement would be a useless gesture. Cf. People v. Martin, 45 Cal. 2d 755, 290 P. 2d 855; Wilgus, Arrest Without a Warrant, 22 Mich. L. Rev. 541, 798, 802 (1924).10 But even by that test the evidence upon which the Government relies was not sufficient to justify the officers’ failure expressly to notify the petitioner that they demanded admission to his apartment for the purpose of arresting him.
The single fact known to the officers upon which the Government relies is the “split-second” occurrence in which the petitioner evinced “instantaneous resistance to their entry,” an “almost instinctive attempt to bar their entry after they [the officers] had identified themselves as police ....”■ It is argued that this occurrence “certainly points up that he knew their purpose immediately . . . [and], at once, realized that he had been detected and that the officers were there to arrest him”; [311]*311that “[i]t would be wholly unrealistic to say that the officers had not made their purpose known because they did not more formally announce that they were there to arrest him.”
But, first, the fact that petitioner attempted to close the door did not of itself prove that he knew their purpose to arrest him. It was an ambiguous act. It could have been merely the expected reaction of any citizen having this experience at that hour of the morning, particularly since it does not appear that the officers were in uniform, cf. Accarino v. United States, supra, 85 U. S. App. D. C., at 403, 179 F. 2d, at 465, and the answer “Police” was spoken “in a low voice” and might not have been heard by the petitioner so far as the officers could tell.
Second, petitioner’s reaction upon opening the door could only have created doubt in the officers’ minds that he knew they were police intent on arresting him. On the motion to suppress, agent Wilson testified that “he wanted to know what we were doing there.” This query, which went unanswered, is on its face inconsistent with knowledge. The majority of the Court of Appeals denied the import of the query by inferring that Miller knew Wilson and Wurms personally and recognized them as soon as he opened the door. That inference has no support in the record.11 But even if this inference were [312]*312supportable, Miller’s recognition of Wilson and Wurms as police officers would not have justified them, in light of other facts known to them, in being virtually certain that Miller actually knew the reason for their presence. The officers knew that petitioner was unaware of Shepherd’s arrest; they knew that he was unaware that the currency was marked; they .knew that he was unaware that their presence was pursuant to a plan, initiated by Reed’s disclosures, to catch the petitioner in a criminal act. Moreover, they did not actually know that petitioner had made a sale to Shepherd and received the marked money, for Shepherd had not talked and had not been seen to enter petitioner’s apartment. The fact that the marked money was found in the apartment has no bearing upon the petitioner’s knowledge of the officers’ purpose since he did not know that the money was marked. This Court said in United States v. Di Re, supra, at 595: “We have had frequent occasion to point out that a search is not to be made legal by what it turns up. In law it is good or bad when it starts and does not change character from its success.” The most that can be said is that the petitioner’s act in attempting to close the door might be the basis for the officers being virtually certain that the petitioner knew there were police at his door conducting an investigation. This, however, falls short of a [313]*313virtual certainty that the petitioner knew of their purpose to arrest him. The requirement is not met except by notice of that purpose, for the Government admits that the officers had no authority to break the petitioner’s door except to arrest him. We must, therefore, conclude that the petitioner did not receive the required notice of authority and purpose.
We are duly mindful of the reliance that society must place for achieving law and order upon the enforcing agencies of the criminal law. But insistence on observance by law officers of traditional fair procedural requirements is, from the long point of view, best calculated to contribute to that end. However much in a particular case insistence upon such rules may appear as a technicality that inures to the benefit of a guilty person, the history of the criminal law proves that tolerance of shortcut methods in law enforcement impairs its enduring effectiveness. The requirement of prior notice of authority and purpose before forcing entry into a home is deeply rooted in our heritage and should not be given grudging application. Congress, codifying a tradition embedded in Anglo-American law, has declared in § 3109 the reverence of the law for the individual’s right of privacy in his house.12 Every householder, the good and the bad, the guilty and the innocent, is entitled to the protection designed to secure the common interest against unlawful invasion of the house. The petitioner could not be lawfully arrested in his home by officers breaking in without first giving him notice of their authority and purpose. Because the petitioner did not receive that [314]*314notice before the officers broke the door to invade his home, the arrest was unlawful, and the evidence seized should have been suppressed.
Reversed.
MR. Justice Harlan concurs in the result.