Commonwealth v. Yong, 177 A.3d 876

Narcotics officers conducted three days of surveillance at 3200 block of N. Fairhill St.; Officer McCook observed controlled buys on Sept. 21 and 23 implicating Yong and others; buy packets field-tested positive for marijuana.
Officers briefed together and executed a search warrant at the residence on Sept. 23; Officer Gibson (arresting officer) seized Yong as team entered and recovered a .38 revolver from Yong during a pat-down.
Yong moved to suppress evidence, arguing Gibson lacked probable cause or reasonable suspicion and there was no evidence McCook communicated probable-cause information to Gibson at the suppression hearing.
Trial court denied suppression; jury convicted Yong of firearm offenses and conspiracy; Superior Court reversed suppression ruling, holding collective-knowledge required communication or instruction from the officer with probable cause.
Commonwealth appealed to the Pennsylvania Supreme Court, which considered whether an officer’s knowledge may be imputed to a teammate absent an express directive or communication when officers are working as a team.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether an officer’s knowledge establishing probable cause can be imputed to another officer who effects an arrest when they are "working as a team" but no evidence shows a directive or communication from the knowledgeable officer	Yong: Arresting officer Gibson had no probable cause or reasonable suspicion; no evidence McCook communicated or ordered the arrest, so the seizure was unconstitutional	Commonwealth: Collective knowledge of a coordinated team can be aggregated without explicit directive; communication need not be shown to impute probable cause	Court: Reversed Superior Court. Adopted a limited rule: Pennsylvania follows vertical collective-knowledge but will impute knowledge where an officer with probable cause was present, working with the arresting officer, and would have inevitably and imminently ordered the seizure — so Yong’s arrest was constitutional
Whether a protective pat-down of Yong was permissible under Terry given mere presence during execution of a warrant	Yong: Mere presence is insufficient for Terry frisk absent articulable facts; suppression needed	Commonwealth: The team’s collective investigation and McCook’s observations justified search/seizure	Court: Did not separately rely on mere presence rule; upheld search as constitutional because of the imputed/inevitable-order rationale tied to team operation

Whiteley v. Warden, 401 U.S. 560 (1971) (officers may act on a bulletin or communication from others who had probable cause, but an invalid underlying complaint cannot be cured by reliance alone)
Hensley v. Burress, 469 U.S. 221 (1985) (collective-knowledge doctrine justified reliance on flyers/bulletins issued by other jurisdictions; promotes prompt interjurisdictional police action)
Williams v. United States, 308 F.2d 326 (D.C. Cir. 1962) (early articulation of imputing an organization’s collective knowledge to an officer asked to make an arrest)
Commonwealth v. Kenney, 297 A.2d 794 (Pa. 1972) (Pennsylvania application of vertical collective-knowledge where an officer acted on orders of a superior who had probable cause)
Commonwealth v. Queen, 639 A.2d 443 (Pa. 1994) (reversed where directing officer did not testify at suppression hearing; articulable facts supporting reasonable suspicion must be in the record)
United States v. Ragsdale, 470 F.2d 24 (5th Cir. 1972) (endorses treating officers working closely as a unit where immediate action was required; practical reasonableness can justify imputing knowledge)
United States v. Chavez, 534 F.3d 1338 (10th Cir. 2008) (discusses horizontal vs. vertical collective-knowledge frameworks and aggregation of officers’ information)
United States v. Massenburg, 654 F.3d 480 (4th Cir. 2011) (criticizes broad horizontal imputation without communication as incentivizing unlawful searches)