Cite as: 540 U. S. 31 (2003)
Opinion of the Court
lapse of an even more substantial amount of time." Ibid.
The panel majority put the action of the officers here in the last category, on the understanding that they destroyed the door without hearing anything to suggest a refusal to admit even though sound traveled easily through the small apartment. The majority held the 15-to-20-second delay after knocking and announcing to be "[in]sufficient . . . to satisfy the constitutional safeguards." Id., at 705.
Judge Fisher dissented, saying that the majority ought to come out the other way based on the very grounds it stressed: Banks's small apartment, the loud knock and announcement, the suspected offense of dealing in cocaine, and the time of the day. Judge Fisher thought the lapse of 15 to 20 seconds was enough to support a reasonable inference that admittance had been constructively denied. Id., at 710.
We granted certiorari to consider how to go about applying the standard of reasonableness to the length of time police with a warrant must wait before entering without permission after knocking and announcing their intent in a felony case. 537 U. S. 1187 (2003). We now reverse.
II
There has never been a dispute that these officers were obliged to knock and announce their intentions when executing the search warrant, an obligation they concededly honored. Despite this agreement, we start with a word about standards for requiring or dispensing with a knock and announcement, since the same criteria bear on when the officers could legitimately enter after knocking.
The Fourth Amendment says nothing specific about formalities in exercising a warrant's authorization, speaking to the manner of searching as well as to the legitimacy of searching at all simply in terms of the right to be "secure . . . against unreasonable searches and seizures." Although the notion of reasonable execution must therefore be fleshed
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