Cell phones hold vast amounts of personal information. As a result, many people are understandably very protective of their phones. In Minnesota, police cannot simply unlock and search them without meeting specific constitutional requirements.
Under the Fourth Amendment to the U.S. Constitution and Article I, Section 10 of the Minnesota Constitution, individuals are protected from unreasonable searches and seizures. Courts have consistently held that a warrant is required for law enforcement to access the digital contents of a cell phone, except in limited circumstances.
Exceptions to this broader rule
The U.S. Supreme Court case Riley v. California established the nationwide rule that cell phones are legally different from other items found during an arrest because of the immense amount of private data they contain. As a result, officers must generally obtain a warrant supported by probable cause before searching the contents of a phone. Minnesota courts follow this precedent, requiring police to seek judicial approval before unlocking or reviewing text messages, call logs, photos and apps.
With that said, there are exceptions to the warrant requirement. In emergencies—such as when officers believe immediate access is necessary to prevent harm, destruction of evidence or to respond to an urgent public safety threat—law enforcement may argue that they can search a device without a warrant. However, these situations are narrowly interpreted.
Another important distinction involves consent. If a person voluntarily provides a passcode or agrees to let officers search their phone, a warrant may not be necessary. Yet, consent must be clear and freely given, without coercion, to be upheld in court.
Ultimately, the legal standard in Minnesota is that police typically need a warrant to unlock or search a cell phone. If officers try to bypass this requirement or rely on weak justifications for a warrantless search, evidence they obtain may be excluded from trial if criminal charges are brought against a person whose phone was searched unlawfully. For anyone facing charges where phone evidence is involved, a strong defense may involve challenging whether law enforcement followed correct legal procedures.