by Douglas Ankney

In a unanimous decision, the Supreme Judicial Court of Massachusetts held that a motor vehicle stop conducted 24 hours after an officer witnessed a civil traffic infraction violated art. 14 of the Massachusetts Declaration of Rights. Addressing a question of first impression, the Court adopted a totality-of-the-circumstances framework for evaluating the reasonableness of delayed traffic stops, ruling that while no rigid time limit governs when police authority to stop a vehicle for an observed infraction expires, that authority terminates when the delay is unreasonable under the totality of the circumstances. Because the Commonwealth could not explain why the observing officer failed to request a marked cruiser at the time of the infraction yet took that precise step the following day, the Court reversed the suppression ruling, vacated the defendant’s cocaine trafficking conviction, and remanded the matter.

Background

On March 27, 2019, members of a Boston police drug control unit were conducting surveillance in the Brighton neighborhood. Sergeant Detective William J. Feeney observed the defendant, Jose Arias, enter a gray SUV and drive away. Based on Feeney’s radio communications, Officer Mathew Pieroway located the SUV and followed it roughly six miles into Jamaica Plain, where Pieroway, driving an unmarked vehicle, watched the defendant pull to the right of approximately seven vehicles stopped behind a stop sign, pass the line of traffic, run the stop sign, and cut left in front of the stopped cars. Pieroway did not attempt to stop the defendant and did not radio for a marked cruiser to do so. Concluding it was unsafe to continue following the SUV, Pieroway ended his surveillance.

The next afternoon, Feeney again observed the defendant leave a Brighton residence in the same SUV. After locating the vehicle through Feeney’s radio updates, Pieroway, who was once again in an unmarked car, requested at 3:27 p.m. that a marked cruiser execute a stop, broadcasting over police radio that officers were “looking to stop a vehicle for [a] drug investigation.” Officers stopped the SUV, directed the defendant out, and performed a pat frisk that uncovered a hard object in his pocket, which the defendant acknowledged was cocaine. Following his arrest, the defendant directed officers to additional cocaine inside the vehicle.

The defendant was charged with cocaine trafficking. He moved to suppress all evidence from the stop under both the Fourth Amendment and art. 14. A Superior Court judge denied suppression of the physical evidence, concluding that the stop was lawful despite resting on an infraction observed the prior day and noting the absence of Massachusetts authority addressing whether such a delay was permissible. After a mistrial at his first trial and reduction of the indictment, the defendant was convicted at a second trial of trafficking 18 to 36 grams of cocaine. The Supreme Judicial Court granted direct appellate review.

Analysis

The Court reviewed the suppression ruling under its established standard, viz., subsidiary factual findings are accepted absent clear error, but constitutional conclusions are assessed independently. Commonwealth v. Buckley, 90 N.E.3d 767 (Mass. 2018). Because art. 14 provides at least as much protection as the Fourth Amendment, see Commonwealth v. Delgado-Rivera, 168 N.E.3d 1083 (Mass. 2021), the Court analyzed the claim under art. 14, reasoning that meeting those standards would necessarily satisfy federal requirements as well. Garcia v. Commonwealth, 158 N.E.3d 452 (Mass. 2020).

The Court reaffirmed several foundational principles before turning to the novel question presented. A traffic stop constitutes a seizure under art. 14 and must therefore be reasonable. Commonwealth v. Rodriguez, 37 N.E.3d 611 (Mass. 2015). An officer who witnesses a traffic violation may lawfully stop the offending vehicle regardless of the officer’s subjective motivation, because permitting such stops advances the government’s compelling interest in roadway safety. Buckley. At the same time, the observation of an infraction does not grant “bottomless authority to seize a defendant.” Commonwealth v. Daveiga, 183 N.E.3d 1127 (Mass. 2022). Police authority expires once the purpose of the stop has been fulfilled. Rodriguez v. United States, 575 U.S. 348 (2015).

Delayed Traffic Stops:
A New Framework

While Daveiga had noted that police authority to conduct a traffic stop “terminates” following an “unreasonable delay,” the Court recognized that it had never before squarely examined what makes a delayed stop unreasonable. The Court observed that the constitutional balance shifts as time passes. On the governmental side, citing United States v. Hensley, 469 U.S. 221 (1985), the Court reasoned that a driver who committed an infraction in the past but presently appears to be operating lawfully poses a diminished safety concern compared to one actively breaking the law. On the individual’s side, the risk of arbitrary police action, a core concern under art. 14, grows with delay. Heightening this risk in the traffic-infraction context is the reality that civil violations are “uniquely suited to manipulation and misuse,” given that virtually no driver can travel any meaningful distance without committing some minor violation, the Court stated. Commonwealth v. Pappas, 425 N.E.2d 323 (Mass. 1981).

Guided by these considerations, the Court endorsed the approach taken by federal courts that have evaluated delayed stops under a flexible, multi-factor inquiry rather than a fixed deadline. Specifically, the Court adopted the Fifth Circuit’s formulation in United States v. Zuniga, 860 F.3d 276 (5th Cir. 2017), that “the elapsed time between an observed violation and any subsequent stop must be reasonable upon consideration of the totality of the circumstances.” Relevant factors include the length of the delay, any justification for it, and the character of the underlying violation. The Court further reaffirmed from Daveiga that an observed infraction “cannot hang over a suspect indefinitely until a time at which he has engaged in some other suspicious activity that officers believe warrants a pretextual stop.” When the totality of the circumstances reveals an unreasonable delay, police authority to stop on the basis of that violation ceases, the Court instructed. Consistent with the standard applied to all warrantless seizures, the Commonwealth bears the burden of establishing reasonableness. Commonwealth v. Shields, 521 N.E.2d 987 (Mass. 1988).

Application to the Facts

The Court acknowledged that Pieroway had a legitimate safety-based reason for not personally pursuing the SUV at the moment of the infraction, given the defendant’s dangerous maneuver and Pieroway’s unmarked vehicle. To that extent, some delay was justified, according to the Court.

Nevertheless, the Court determined that the Commonwealth failed to account for the full 24-hour gap. The delay was longer than the one-hour delay found unreasonable in United States v. Mendonca, 682 F. Supp. 2d 98 (D. Mass. 2010) (one-hour delay following series of traffic violations unreasonable where not required “to gain a tactical advantage” in making stop and where “obvious rationale” for stop was to investigate unrelated conduct; defendant had loaded suspicious packages into vehicle during delay), and longer than the delays of mere minutes to a few hours addressed in other cases. The infraction at issue, failing to stop at a stop sign after an unsafe passing maneuver, was a completed, one-time event rather than a continuing violation that might sustain suspicion over a prolonged period, the Court explained.

Most importantly, the Court stated that the record offered no adequate explanation for why Pieroway did not call for a marked cruiser at the time of the infraction. When questioned at the suppression hearing, Pieroway responded with only the single word “safety” and stated that he simply had no intention of stopping the SUV that day. The Court found the lack of explanation significant because the next day, after again locating the defendant’s vehicle while operating from an unmarked car, Pieroway did what the Commonwealth failed to show he could not have done 24 hours earlier. That is, he requested that a marked cruiser execute the stop.

Although the record supported the judge’s finding that the stop for the traffic infraction was pretextual and intended to advance a drug investigation, that fact neither removed the stop’s objective justification under established law nor supplied the missing rationale for the delay, the Court explained. The mere existence of the drug investigation did not reasonably justify waiting 24 hours to stop the defendant for the traffic infraction, and the Commonwealth did not argue otherwise. Because the Commonwealth bore the burden of proving reasonableness and the absence of evidence explaining the gap could not inure to its benefit, the Court concluded that the stop was unconstitutional under art. 14.

Conclusion

Accordingly, the Court reversed the denial of the defendant’s motion to suppress, vacated the conviction, set aside the verdict, and remanded the matter to the Superior Court. See: Commonwealth v. Arias, 277 N.E.3d 199 (Mass. 2026).  

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