Minnesota high court restricts broad geofence warrants

The Minnesota Supreme Court, in the Contreras‑Sanchez matter, ruled recently that geofence warrants — orders that compel companies like Google to turn over device location identifiers from a defined place and time — are not categorically banned under the state constitution but must meet the traditional requirement of particularity. In a 4–2 decision the court found the warrant at issue unconstitutional because it was overly broad: prosecutors had sought roughly a month of Google location data tied to a crime scene, effectively allowing investigators unchecked discretion to sort through thousands of device IDs. The court reversed a conviction tied to that warrant and narrowed how Minnesota judges may authorize geofence searches going forward.

The ruling comes against a backdrop of widespread law‑enforcement use of geofence requests: more than 11,500 such orders were served on Google in 2020, illustrating how routinely this tool has been used in investigations, including serious crimes such as homicide. That context has heightened concern about the potential for mass digital surveillance to sweep up innocent people’s movements—an especially sensitive issue in jurisdictions confronting stark racial disparities in violent‑crime statistics. Minnesota’s 2023 homicide figures, for example, show a disproportionate share of victims and alleged offenders from Black communities, a reality that privacy advocates say makes rigorous constitutional limits on broad location searches particularly important to prevent disparate intrusion into those communities.

Public reaction and legal advocacy helped drive attention to the case. Civil‑liberties groups including the ACLU and the Electronic Frontier Foundation, supported by the National Association of Criminal Defense Lawyers, filed amicus briefs arguing the warrant was overly broad; social media and local reporting reflected that pressure, with commentators noting the court moved ahead of a pending U.S. Supreme Court consideration of similar questions. The coverage itself has shifted: earlier reporting often treated geofence warrants as routine investigative tools, while more recent accounts — led by outlets that highlighted the Contreras‑Sanchez reversal — emphasize constitutional limits, the risks of bulk location surveillance, and the role of courts in policing particularity. Minnesota’s decision may therefore recalibrate both prosecutorial practice in the state and the national conversation about how to balance modern investigative techniques with Fourth Amendment protections.