Matthew Joseph Sheehan was the subject of a multi-month investigation by Michigan State Police involving four different confidential informants. These informants reported that Sheehan trafficked drugs from Minnesota and Wisconsin into Iron River, Michigan, and identified his residence, vehicle, and phone number. Police corroborated these tips through a controlled buy of MDMA at Sheehan's home and by analyzing historic cell-site data, which revealed a pattern of monthly trips to the La Crosse, Wisconsin area. In June 2023, a 'ping' warrant tracked Sheehan's phone to La Crosse, where he stayed briefly before driving back toward Iron River. Based on this real-time data and prior intelligence, police stopped Sheehan, found a pound of methamphetamine in his trunk, and subsequently obtained a warrant to search his home, where they found more drugs and currency. Sheehan moved to suppress all evidence, arguing the initial stop lacked reasonable suspicion, but the district court denied the motion. Sheehan pleaded guilty but reserved his right to appeal the suppression ruling.
The Sixth Circuit reviewed the district court's finding of reasonable suspicion de novo, applying the totality-of-the-circumstances standard established in United States v. Arvizu. The court emphasized that reasonable suspicion requires only a 'moderate chance' of criminal activity, a standard significantly lower than probable cause. The court found that the combination of four informant tips, a recorded controlled buy, and cell-site data confirming Sheehan's travel patterns provided sufficient articulable facts. Specifically, the court noted that the informants' tips were corroborated by independent police investigation, including the verification of Sheehan's identity and the timing of his trips. Sheehan argued that the informants were unreliable due to their cooperation for leniency and prior convictions, but the court held that independent corroboration cured any reliability concerns. Regarding the staleness of the tips, the court reasoned that drug trafficking is an ongoing crime, and the evidence showed Sheehan had been active since March 2022. The fact that his trips ceased temporarily when his supply ran dry, only to resume when he found a new source, supported the conclusion that the information was not stale. The court concluded that the police had a reasonable basis to believe Sheehan was returning from a drug run when stopped. Consequently, the evidence obtained from the vehicle was admissible, and the search warrant for his residence, which relied on that evidence, was also valid.
The decision affirms Sheehan's conviction and 84-month prison sentence, confirming that law enforcement can rely on a combination of multiple informant tips and digital location data to establish reasonable suspicion for a traffic stop in drug trafficking cases. The ruling reinforces that the reasonable suspicion standard is low and that the ongoing nature of a crime can prevent tips from becoming stale even if some time has passed since the initial report. No remand instructions were issued as the conviction stands.
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