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Appeals court weighs legality of frisk after ShotSpotter activation in Marin suppression appeal
Summary
The court considered whether police had reasonable suspicion to conduct a pat-frisk of a man leaving the vicinity of a ShotSpotter activation in Holyoke, with debate over the reliability and evidentiary weight of the ShotSpotter alert and officers' observations.
The Massachusetts Appeals Court heard argument Jan. 8 in Commonwealth v. Marin, Docket No. 24-454, on whether Sergeant testimony and a ShotSpotter activation provided sufficient reasonable suspicion to justify a pat-frisk and subsequent discovery of a weapon.
Counsel for the Commonwealth argued the totality of the circumstances—police response to a ShotSpotter alert near a nightclub, a vehicle that officers followed to obtain registration, and the driver’s evasive conduct and eye contact with an officer—supported reasonable suspicion that the occupant was armed and dangerous. The prosecutor pressed that a person leaving the scene of a reported shooting and making furtive or evasive movements can be reasonably suspected of being armed.
Defense counsel disputed the sufficiency of the record, emphasizing the lack of findings on key facts, the omission of independent corroboration of the ShotSpotter activation, and the presence of multiple bystanders in a nightclub area. Counsel argued the judge’s factual bindings were sparse and that the court could not fairly evaluate reasonable suspicion without clearer findings about the proximity to the ShotSpotter activation, whether the vehicle was the only car in the area, or whether witnesses corroborated hearing gunfire.
The motion judge had credited the sergeant’s testimony but did not make detailed findings about some contested facts; counsel for the Commonwealth asked appellate judges to remand for further findings or to reverse, arguing there was adequate evidence to support a pat-frisk. Counsel for the defendant urged the appeals court to affirm suppression, saying the record lacked sufficient corroboration and that ordinary acts—leaving a scene after an apparent disturbance—do not alone justify a frisk.
The panel heard extended questioning about how courts treat ShotSpotter activations, the reliability the technology requires, and whether the officer’s observation of silence, a statement that the person did not speak English, and sustained eye contact could permissibly factor into reasonable-suspicion calculus. After argument the case was submitted to the panel for decision.
