In California v. Greenwood, the Supreme Court ruled 6-2 in 1988 that the Fourth Amendment does not protect garbage left at the curb for collection. Police can pull those bags, look inside, and use whatever they find, all without a warrant. The decision remains the controlling federal rule on trash searches and one of the most cited authorities on the line between private life and public exposure.1Justia U.S. Supreme Court Center. California v. Greenwood, 486 U.S. 35 (1988)
How the Case Reached the Supreme Court
In early 1984, Investigator Jenny Stracner of the Laguna Beach Police Department received tips that a local resident, Billy Greenwood, was involved in drug trafficking. A separate criminal suspect had told a federal drug agent that a truck loaded with narcotics was headed for Greenwood’s address. Stracner did not have enough for a warrant on the house, but she noticed Greenwood regularly set opaque plastic garbage bags at the curb for pickup.1Justia U.S. Supreme Court Center. California v. Greenwood, 486 U.S. 35 (1988)
On April 6, 1984, Stracner asked the neighborhood’s regular trash collector to pick up Greenwood’s bags separately and hand them over. Inside were items indicating narcotics use. That gave her probable cause for a warrant to search the house itself, where officers found cocaine and hashish. A second investigator repeated the trash pull a month later, found more evidence, and secured a second warrant.1Justia U.S. Supreme Court Center. California v. Greenwood, 486 U.S. 35 (1988)
Greenwood argued the warrantless trash searches violated the Fourth Amendment and that everything flowing from them should be thrown out. The case eventually reached the Supreme Court.
The Ruling and Its Reasoning
Justice Byron White, writing for the six-justice majority, held that the Fourth Amendment does not prohibit the warrantless search and seizure of garbage left for collection outside the curtilage of a home. Justice Kennedy took no part in the case; Justices Brennan and Marshall dissented.1Justia U.S. Supreme Court Center. California v. Greenwood, 486 U.S. 35 (1988)
The Court’s test for whether a police action counts as a “search” comes from Katz v. United States: the person must have shown a subjective expectation of privacy, and society must be prepared to recognize that expectation as reasonable. Greenwood, the majority said, failed the second half.2Constitution Annotated. Amdt4.3.3 Katz and Reasonable Expectation of Privacy Test
Two lines of reasoning did the work. First, trash bags on a public curb are vulnerable to animals, children, scavengers, and passersby. Contents so readily accessible to the general public cannot support a claim that no one will look. Second, Greenwood placed the bags at the curb precisely so a private hauler would take them. That handoff to a third party, in the Court’s view, ended whatever expectation of confidentiality he had. Once the hauler could lawfully look through the bags or pass them along, so could the police.1Justia U.S. Supreme Court Center. California v. Greenwood, 486 U.S. 35 (1988)
Where the Rule Stops: The Curtilage Line
The location of the trash when police obtain it is what makes the rule work or not. Curtilage is the area immediately surrounding a house that shares the home’s strong Fourth Amendment protection. A fenced backyard, a private porch, or a garage typically counts. Police generally cannot enter those spaces to rummage through a trash can any more than they can walk into the living room.3Constitution Annotated. Amdt4.3.5 Open Fields Doctrine
Courts weigh four factors in deciding whether a particular area is curtilage: how close it is to the house, whether it sits inside an enclosure that also surrounds the house, what the area is used for, and what the resident has done to shield it from public view.4Justia. U.S. Constitution Annotated – Fourth Amendment – Search and Seizure – Open Fields
Greenwood’s bags sat on the curb, plainly outside that protected zone. Trash kept inside a fenced yard or on a private patio is a different case. The container’s location at the moment police reach it, not the sensitivity of what’s inside, drives the outcome.
The Brennan Dissent
Justice Brennan, joined by Justice Marshall, argued that a single bag of trash can reveal intimate details about a person’s life: eating habits, reading material, health conditions, sexual practices, financial status, political beliefs, and personal relationships. Rummaging through someone’s garbage, he wrote, is no less invasive than rifling through desk drawers or intercepting phone calls.1Justia U.S. Supreme Court Center. California v. Greenwood, 486 U.S. 35 (1988)
Brennan pushed back on the majority’s premises. The possibility that an animal or a snoop might tear open a bag does not defeat a reasonable expectation of privacy, any more than the possibility of a burglary defeats the expectation of privacy inside a home. Many municipalities also require residents to place garbage at the curb, so treating curbside placement as a voluntary surrender of privacy penalizes people for following local law. Ordinary people, he predicted, would be “shocked to learn” that the Court considered it unreasonable to expect privacy in a sealed trash bag.
States That Protect Trash More Than Federal Law Does
Greenwood set the federal floor, not the ceiling. Several states have read their own constitutions to require a warrant before police search curbside garbage. Courts in at least six states have gone this way, including New Jersey, Vermont, Washington, New Hampshire, New Mexico, and Hawaii. Their reasoning tends to echo Brennan’s: sealed containers hold private information, and the custom of putting them out for pickup is not a meaningful surrender of that privacy.
If you live in one of those states, the Greenwood rule does not govern state and local officers acting under state authority. Federal agents still operate under federal Fourth Amendment standards and can rely on Greenwood anywhere in the country. The result is a patchwork: whether your curbside trash is protected depends on where you live and which government is investigating.
Greenwood in the Digital Age
Greenwood’s third-party logic made intuitive sense in 1988, when handing a bag to a trash hauler was a deliberate, physical act. It fits less comfortably in an era when owning a smartphone means constantly transmitting location data, browsing history, and app usage to private companies most people never think about.
The Supreme Court took a step back from that logic in Carpenter v. United States (2018), a 5-4 decision holding that police generally need a warrant to obtain cell-site location records from a wireless carrier. Chief Justice Roberts wrote that a person keeps a legitimate expectation of privacy in the record of their physical movements captured through cell-tower data, even though a third-party company holds those records. The Court declined to extend the third-party doctrine to cover this “exhaustive chronicle of location information.”5Supreme Court of the United States. Carpenter v. United States, 585 U.S. 296 (2018)
Carpenter did not overrule Greenwood. Physical trash at the curb remains fair game under federal law. But the Court is scheduled to hear Chatrie v. United States in April 2026, a case asking whether police need a warrant to obtain “geofence” data identifying every phone user in a given location at a given time. The petitioner argues that agreeing to an app’s terms of service is not the same as voluntarily surrendering location history, an argument that runs close to Brennan’s point about residents who have no real alternative to putting trash at the curb.
Protecting Your Own Records
Because curbside trash has no federal Fourth Amendment protection, the practical defense is to keep sensitive material out of the bag. Shred financial records, medical documents, prescription labels, and anything with account numbers before discarding them. Cross-cut shredders that reduce paper to confetti are far harder to reconstruct than strip-cut models, which leave readable ribbons.
For documents you still need, the IRS suggests keeping tax records for three years from the date you filed the return, with certain situations stretching that to six or seven years, and property-related records until the retention period expires for the year you dispose of the property. If you never filed a return or filed a fraudulent one, the agency says to keep records indefinitely.6Internal Revenue Service. How Long Should I Keep Records?
Once a document has served its purpose, shredding it before it leaves the house is the only reliable way to keep it from anyone who happens to walk by on trash day.