The case in one breath
Police arrested a man, went through his smartphone without a warrant, and used what they found to convict him. In 2014, the Supreme Court said no — unanimously. Your phone holds “the privacies of life,” and if police want to search its data, the rule is three words long: get a warrant.
Decided
June 25, 2014
Vote
9–0
Opinion by
Chief Justice Roberts
Protects
Your phone’s data
The Story
Every landmark case starts as an ordinary day. This one started with expired tags.AUG 2009David Riley is pulled over in San Diego for expired registration tags. His license turns out to be suspended, so his car gets impounded — and during the inventory search, officers find two loaded handguns hidden under the hood.
SAME DAYRiley is arrested. An officer takes his smartphone and starts scrolling — no warrantWarrant: a judge’s written permission for a search, based on probable cause. The Fourth Amendment’s default requirement., just the longstanding assumption that anything on an arrested person is searchable. Photos and messages on the phone link Riley to a gang and to a shooting weeks earlier.
TRIALThe phone evidence is used against him. Riley is convicted and receives a sentence of 15 years to life. His lawyers argue the phone search violated the Fourth Amendment.
APR 2014The Supreme Court hears Riley’s case together with a companion case, United States v. Wurie — an older flip phone searched after a Boston arrest. Old rule vs. new technology, squarely presented.
JUN 2014All nine justices agree: searching a phone’s digital data is nothing like searching a wallet. Warrant required. The digital age gets its first great privacy landmark.
The Question the Court Faced
For decades, the rule from cases like United States v. Robinson (1973) was simple: when police lawfully arrest you, they can search what’s on you — pockets, wallet, cigarette pack — no extra warrant needed. That rule existed to protect officers from hidden weapons and to stop evidence from being destroyed.
The question in Riley: does that rule stretch to the data inside a smartphone? Is scrolling through someone’s messages, photos, and location history just a modern pocket search — or something completely different?
What the Court Decided
Something different. Completely different.“Modern cell phones are not just another technological convenience. With all they contain and all they may reveal, they hold for many Americans ‘the privacies of life.'”— Chief Justice Roberts, for a unanimous Court
The Court walked through the old rule’s two justifications and showed neither fits data: digital information can’t stab an officer, and once a phone is seized, the risk of the arrestee deleting things can be handled without reading everything (secure the phone, get the warrant). And comparing a phone search to a pocket search? Roberts had a line for that too:
“That is like saying a ride on horseback is materially indistinguishable from a flight to the moon.”— on treating phone searches like pocket searches
A phone isn’t an object so much as a portal — to years of messages, every photo, your location history, health data, browsing, banking. Searching it is more revealing than ransacking a house. So the Court’s instruction to police, in the plainest closing any landmark opinion ever had:
“Get a warrant.”— the last three words of the Court’s answer
The ruling wasn’t absolute — true emergencies (exigent circumstancesExigent circumstances: a genuine emergency — danger to life or imminent destruction of evidence — that lets police act without waiting for a warrant. Judged case by case.) can still justify immediate action, and your consentConsent: you agreeing to a search. It waives the warrant requirement — and you’re always allowed to refuse. always opens the phone. But the default flipped: the data is protected first, searchable second.
What It Means for You
✓ BECAUSE OF RILEY
- Police generally need a warrant to search your phone’s data — even after arresting you
- You can refuse consent to a phone search, and refusal can’t be held against you
- Police can hold your phone as evidence, but holding and opening are separate legal steps
- Courts extended the logic in Carpenter (2018): your location history needs a warrant too
✗ RILEY DOESN’T MEAN
- Police can never see your phone — a warrant, your consent, or a true emergency opens it
- Lock-screen notifications in plain view are off-limits (they’re not)
- The border works the same way (border searches have weaker protections)
- You can’t be asked to unlock — asking is legal; you’re allowed to say no
Questions People Ask About This Case
Did David Riley go free?
No — and this surprises people. Winning at the Supreme Court meant the phone evidence was unconstitutionally obtained, and his case went back down for California courts to sort out the consequences; his convictions ultimately stood based on the remaining evidence. Landmark cases often work this way: the named person’s outcome barely changes, while the rule changes for everyone after them.
Why did even the most police-friendly justices agree?
Because the math was undeniable. By 2014, a phone carried more private information than any home ever could, and the old pocket-search rule was written for a world of cigarette packs. All nine justices — across every ideology — saw that stretching the old rule to phones would effectively delete the Fourth Amendment for the digital age. (Justice Alito wrote separately to note some reservations, but joined the judgment: warrant required.)
What was the companion case, Wurie?
Brendan Wurie was arrested in Boston, and police used his flip phone’s call log to find his apartment. The Court decided both cases together on purpose: one cutting-edge smartphone, one basic flip phone — and the rule came out the same for both. It’s not about how fancy the phone is; it’s about the privacy of the data.
Does Riley protect Face ID and passcodes too?
Not directly — that’s the next battleground. Riley says police need a warrant to search the data; whether they can force you to unlock the phone is a Fifth Amendment question courts are still splitting on. Memorized passcodes get the strongest protection; compelled face and fingerprint unlocks are genuinely unsettled. Full breakdown in our article: Can police search your phone?
Why do people call Riley the most important privacy case of the digital age?
Because it’s the moment the Constitution officially entered the smartphone era. Instead of mechanically applying a 1970s rule, the Court asked what the Fourth Amendment’s purpose requires when technology changes what a “search” reveals. That reasoning became the blueprint — Carpenter v. United States (2018) used it to protect location records, and courts keep citing Riley whenever new tech meets old rules.
Words in This Case, Explained
Search incident to arrest — the old doctrine letting police search an arrested person and their immediate reach, for officer safety and evidence preservation. Riley refused to extend it to digital data.
Warrant — a judge’s written permission to search, based on probable cause. Riley’s three-word remedy.
Exigent circumstances — a true emergency justifying immediate warrantless action. The safety valve Riley left open.
Consent — your voluntary agreement to a search; waives the warrant requirement. Always refusable.
Unanimous (9–0) — every justice agreed on the outcome. Rare on major constitutional questions, and part of why Riley carries so much weight.
Cases Connected to This One
Chimel v. California (1969) & United States v. Robinson (1973)The old world: the search-incident-to-arrest doctrine Riley had to confront — built for weapons and wallets, not gigabytes.
Carpenter v. United States (2018)The sequel: using Riley’s logic, the Court held that getting your historical cell-site location records from your carrier generally requires a warrant too.
New Jersey v. T.L.O. (1985)The school connection: schools search under a lower standard — and how Riley applies to phones at school is still being fought over. See Can schools search your backpack?
What’s Still Undecided
Riley answered the search question — and opened three new ones courts are still fighting about as of mid-2026:
- Compelled unlocking — can police force your fingerprint or face onto the phone? Courts are split; memorized passcodes remain the clearest protection.
- The border exception — how deeply devices can be searched at borders and international airports without a warrant varies by federal circuit.
- Phones at school — whether schools’ relaxed search standard reaches a confiscated phone’s contents after Riley is actively contested.
Why this page exists: most case summaries online are written for law students. This one is written for the person whose phone is actually in their pocket. Every fact above comes from the Court’s own opinion — linked below so you can check us.
The Bottom Line
One traffic stop over expired tags ended with the Supreme Court declaring — 9 to 0 — that your phone is not a wallet, your data is not fair game, and the government needs a judge’s permission to read your life. If an officer ever asks for your phone, Riley is the reason you can calmly say: “I don’t consent to a search.” The Court already fought this one for you. Now you know.
Use this rulingCan police search your phone? →
Another landmarkTinker v. Des Moines →
More casesBrowse all court case files →
Sources
Primary sources:- Riley v. California, 573 U.S. 373 (2014) — full opinion — supreme.justia.com
- Riley v. California — argument audio and case summary — oyez.org
- Riley v. California — opinion text — law.cornell.edu
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