What is the right to privacy? Definition and the two strands
In everyday talk, privacy means "leave me alone." In U.S. constitutional law, it splits into two strands that are easy to mix up:
- Informational / search privacy: the government can't snoop into your home, papers, or data without a good reason, usually a warrant. That comes from the Fourth Amendment.
- Decisional privacy (autonomy): some intimate choices, like contraception, marriage, and family life, are yours to make. That's read into the "liberty" protected by the Due Process Clause.
- Word "privacy" in Constitution?
- No
- Search strand
- 4th Amendment; Katz "reasonable expectation of privacy" test
- Decision strand
- 14th Amendment due process; Griswold, Lawrence, Obergefell
- Big shift
- Dobbs (2022): no constitutional right to abortion
Where the idea came from: Warren, Brandeis, and "the right to be let alone"
The modern idea starts with a law review article. In 1890, Samuel Warren and Louis Brandeis published "The Right to Privacy" in the Harvard Law Review (4 Harv. L. Rev. 193). They were reacting to new tech: instant cameras and gossip newspapers. Sound familiar?
Brandeis carried the idea onto the Supreme Court. In Olmstead v. United States, 277 U.S. 438 (1928), the majority said wiretapping phone lines without entering a home wasn't a "search." Brandeis dissented, calling the "right to be let alone" "the most comprehensive of rights and the right most valued by civilized men."
Every big jump in technology seems to drag privacy law along behind it. Cameras in 1890, telephones in 1928, smartphones today. The law keeps showing up a decade late, holding the same old question in a new shape.
The search strand: Katz to Carpenter
- Katz v. United States
- 389 U.S. 347 (1967): bugging a public phone booth was a search; the Fourth Amendment "protects people, not places"
- Riley v. California
- 573 U.S. 373 (2014): police generally need a warrant to search a phone seized during an arrest
- Carpenter v. United States
- 585 U.S. 296 (2018): getting historical cell-site location records is a search; generally needs a warrant
Katz overruled Olmstead. Justice Harlan's concurrence gave courts the test still used today: did the person have an actual expectation of privacy, and is it one society recognizes as reasonable?
Riley's line is great: modern phones hold "the privacies of life." Chief Justice Roberts's answer to what police should do? "Get a warrant." Carpenter then extended that thinking to location data held by phone companies. The digital side gets fuller treatment on privacy rights in the U.S..
Two other cases fill in the picture. In Kyllo v. United States, 533 U.S. 27 (2001), police aimed a thermal imager at a house to spot heat lamps used for growing marijuana. Justice Scalia's majority said using sense-enhancing technology not in general public use to learn details inside a home is a search. In United States v. Jones, 565 U.S. 400 (2012), agents attached a GPS tracker to a suspect's car and followed it for 28 days. All nine justices agreed that was a search, but for different reasons: the majority relied on the physical trespass onto the car, while concurrences argued long-term tracking violates reasonable expectations even without touching anything. That second idea is the one Carpenter later built on.
The decision strand: Griswold to Dobbs
In Griswold v. Connecticut, 381 U.S. 479 (1965), the Court struck down a law banning married couples from using contraceptives. Justice Douglas wrote that specific guarantees in the Bill of Rights have "penumbras" that together create "zones of privacy." Others grounded it in due process liberty. See Griswold v. Connecticut.
- 1972: Eisenstadt v. Baird extends contraception rights to unmarried people.
- 1973: Roe v. Wade recognizes a right to abortion.
- 2003: Lawrence v. Texas, 539 U.S. 558, strikes down laws criminalizing same-sex intimacy.
- 2015: Obergefell v. Hodges protects same-sex marriage.
- 2022: Dobbs overrules Roe, holding abortion is not "deeply rooted" in history and tradition.
The majority in Dobbs said its ruling covered abortion only. Justice Thomas, concurring, wrote that the Court should reconsider Griswold, Lawrence, and Obergefell too. That's why privacy is suddenly front-page again. The full story is on Roe v. Wade and Dobbs.
U.S. privacy vs. Korean privacy rights
Korea's Constitution does name it. Article 17 says no citizen's privacy shall be infringed, and Article 18 protects the secrecy of communications. The Constitutional Court also recognized a right to informational self-determination (개인정보자기결정권) in its 2005 fingerprinting decision (99헌마513), and the Personal Information Protection Act (2011) built a broad data-protection regime.
| United States | South Korea | |
|---|---|---|
| Text | No explicit privacy clause | Arts. 17 and 18 |
| Data protection | Sector-by-sector laws and state laws | One general statute (PIPA) |
| Reproductive decisions | Left to states after Dobbs | Abortion crime ruled nonconforming (2019, 2017헌바127) |
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Criticism: invented right or essential freedom?
Critics, starting with Justice Hugo Black's dissent in Griswold, say judges invented a right the text doesn't contain. Justice Black put it plainly: he liked his privacy as well as the next person, but couldn't find a constitutional provision protecting it. On this view, these choices belong to legislatures.
Supporters reply that the Ninth Amendment warns against reading the list of rights as complete, and that "liberty" must mean something beyond freedom from physical restraint. They also note the Fourth Amendment strand isn't really controversial at all, and it's growing.
A third critique is practical. The "reasonable expectation" test is circular: once everyone knows the government can track something, nobody "reasonably expects" privacy in it anymore.
What's fascinating is how both sides use history. One says the right isn't deeply rooted; the other says being left alone is the oldest idea in the book. Where you land often depends on how far back you're willing to look, and at whose lives.
Using the right to privacy in exams and papers
- Always split the strands: 4th Amendment search privacy vs. due process autonomy. Graders notice.
- Case chain to memorize: Olmstead → Katz → Riley → Carpenter (search); Griswold → Roe → Lawrence → Dobbs (decisions).
- Related rights: privacy often clashes with speech; the Bill of Rights page shows how the pieces fit.
- Korean study material: 사실적시 명예훼손죄 비범죄화 논의: 헌법상 표현의 자유와 명예권, 형법 제307조 제1항의 문제점 covers the Korean debate over truthful defamation, where privacy and reputation collide with free expression.
- Is the right to privacy in the Constitution?
- Not by name. The Supreme Court has found privacy protections in the Fourth Amendment and in the liberty protected by the Fourteenth Amendment's Due Process Clause.
- What case established the right to privacy?
- Griswold v. Connecticut (1965) is usually cited for decisional privacy; Katz v. United States (1967) set the modern search-privacy test.
- Did Dobbs overturn the right to privacy?
- No. Dobbs held there is no constitutional right to abortion; it said other privacy precedents were not affected, though one concurrence urged revisiting them.
- Does Korea's Constitution protect privacy?
- Yes. Article 17 protects privacy and Article 18 the secrecy of communications.
References and official sources
- Griswold v. Connecticut, 381 U.S. 479 (1965). Justia
- Katz v. United States, 389 U.S. 347 (1967). Justia
- Carpenter v. United States, 585 U.S. 296 (2018). Justia
- Constitution Annotated, Fourth Amendment. congress.gov
- Right to privacy, Wex. Cornell LII
- 대한민국헌법 제17조·제18조. 국가법령정보센터
- Samuel D. Warren & Louis D. Brandeis, "The Right to Privacy," 4 Harv. L. Rev. 193 (1890).