The knock-and-announce rule in Pennsylvania exists by court rule, and it serves important interests. The remedy for violation is suppression of evidence. Pennsylvania does not follow Hudson v. Michigan. Commonwealth v. Frederick, 2015 PA Super 206, 2015 Pa. Super. LEXIS 553 (September 25, 2015):

“The purpose of the ‘knock and announce’ rule is to prevent violence and physical injury to the police and occupants, to protect an occupant’s privacy expectation against the unauthorized entry of unknown persons, and to prevent property damage resulting from forced entry.” Chambers, 598 A.2d at 541. The purpose of the rule may be achieved only through police officers’ full compliance. See id. Indeed, our Supreme Court has held that “in the absence of exigent circumstances, forcible entry without announcement of [identity, authority and] purpose violates Article I, Section 8 of the Pennsylvania Constitution, which proscribes unreasonable searches and seizures.” Carlton, 701 A.2d at 148 (“In a free society, the mere presence of police does not require an individual to throw open the doors to his house and cower submissively before the uniformed authority of the state.”). Our Supreme Court has determined that “the remedy for noncompliance with the knock and announce rule is always suppression.” Crompton, 682 A.2d at 290 (emphasis added).
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