Riley v. Cal. United States
Headline: Police must generally get a warrant before searching an arrested person’s cell phone, limiting warrantless phone searches and protecting private digital information from routine police inspection.
Holding: The Court held that police generally must obtain a warrant before searching digital information on a cell phone taken from an arrested person, with limited exceptions for true emergencies.
- Requires police to get a warrant before searching an arrested person’s cell phone.
- Permits narrow emergency searches when there is imminent danger or risk of evidence destruction.
- May lead courts to exclude evidence from phones searched without a warrant.
Summary
Background
A man stopped for expired registration was arrested after officers found guns in his impounded car. Police seized his smart phone and later reviewed photos and videos that linked him to gang activity. In a separate case, officers arrested a man for an apparent street drug sale, seized a flip phone, used its call log to find an apartment, obtained a warrant, and found drugs and a gun.
Reasoning
The Court considered whether the long-standing rule allowing searches after arrest applies to modern cell phones. It explained that phones hold vast and varied personal data, can access cloud content, and are qualitatively different from small physical items like a cigarette pack or wallet. The Court found the traditional rationale for warrantless searches—officer safety and immediate prevention of evidence loss—largely inapplicable to digital data. The majority therefore held that officers must generally obtain a warrant before searching the digital contents of a seized cell phone, while noting that specific exceptions, like true emergencies, still apply.
Real world impact
The decision protects private digital information by requiring warrants in most cases. Law enforcement can still act in exigent situations and can use practical measures (for example, disconnecting a phone from networks) while seeking warrants. The Court reversed the California appeal in the first case and affirmed the First Circuit in the second, sending the cases back for further proceedings consistent with this rule.
Dissents or concurrances
A separate opinion agreed with the outcome but raised concerns about anomalies and encouraged legislatures to consider detailed rules for balancing privacy and law enforcement needs.
Ask about this case
Ask questions about the entire case, including all opinions (majority, concurrences, dissents).
What was the Court's main decision and reasoning?
How did the dissenting opinions differ from the majority?
What are the practical implications of this ruling?