California v. Greenwood

Executive Summary

California v. Greenwood held that police do not conduct a Fourth Amendment search when they inspect garbage left for collection outside the curtilage of a home. Investigators suspected Billy Greenwood of narcotics trafficking. They asked the regular trash collector to retrieve Greenwood’s opaque garbage bags separately and turn them over to police. Officers searched the bags, found evidence of drug use, and used that information to obtain warrants.

The Supreme Court ruled six to two that Greenwood lacked a reasonable expectation of privacy in the discarded trash. By placing the bags at the curb for collection, he exposed them to the public sufficiently that society was not prepared to recognize his asserted privacy expectation as reasonable. The Court emphasized accessibility to animals, children, scavengers, snoops, and the trash collector, who could have sorted the material or permitted others to do so.

Greenwood is doctrinally important beyond physical garbage. It illustrates the Court’s traditional reliance on exposure to third parties and assumption of risk. Yet the case is fact-specific: opaque bags were placed outside the curtilage for routine collection. It does not necessarily govern trash retained next to a home, containers within curtilage, compelled biological samples, or digital records that reveal extensive personal information. States may—and some do—provide greater protection under their own constitutions or statutes.

Facts and Investigation

Police in Laguna Beach received information that Greenwood might be selling narcotics from his home. An investigator learned that a vehicle associated with the residence had been followed by a federal drug-enforcement agent and that late-night traffic occurred at the property. The investigator sought corroboration.

Greenwood placed tied, opaque plastic garbage bags at the curb for collection. Police asked the neighborhood’s regular trash collector to pick up Greenwood’s bags without mixing them with other refuse and to deliver them to the investigator. A search of the contents revealed items associated with narcotics use. Based partly on that information, police obtained a warrant for the house and found cocaine and hashish.

After Greenwood posted bail, police received reports that trafficking continued. Officers arranged another trash retrieval, found additional evidence, and obtained a second warrant. Greenwood and another resident moved to suppress the evidence, arguing that the initial garbage searches violated the Fourth Amendment and tainted the later warrants.

Procedural History

The California trial court dismissed charges after concluding that the garbage searches violated California law as it then understood the state constitution. The California Court of Appeal affirmed. While the case was pending, however, California voters adopted Proposition 8, which limited exclusion of relevant evidence based solely on state constitutional grounds in criminal proceedings.

The United States Supreme Court therefore addressed the federal Fourth Amendment question. Justice White wrote the majority opinion. Justices Brennan and Marshall dissented. Justice Kennedy did not participate.

Constitutional Question and Holding

The Majority’s Reasoning

The majority accepted that Greenwood may have subjectively expected privacy, especially because the bags were opaque. But Katz requires an expectation society recognizes as reasonable. The Court concluded that trash left on or beside a public street for collection is readily accessible to members of the public.

The opinion listed the people and forces that might disturb refuse: animals, children, scavengers, snoops, and other members of the public. More importantly, Greenwood had placed the bags there for the express purpose of conveying them to a third party, the trash collector. The collector could sort the material or allow others, including police, to inspect it. In the majority’s view, a person assumes the risk that information voluntarily exposed in this way will reach the government.

The Court rejected reliance on the intimate character of the contents. Household trash can reveal private activities, but the Fourth Amendment inquiry turned on exposure and accessibility rather than the sensitivity of individual items. It also rejected the notion that police conduct becomes a search simply because officers act more deliberately than ordinary members of the public.

The majority further explained that state law could impose restrictions beyond the federal floor. But violation of state privacy rules does not automatically establish a federal Fourth Amendment violation. This federal-state distinction remains important for agencies operating in jurisdictions that protect discarded materials more strongly.

The Dissent

Justice Brennan’s dissent emphasized that household garbage can provide an extraordinarily detailed portrait of private life: health, finances, intimate relationships, political activity, reading habits, and personal communications. People use opaque bags precisely to conceal these details and ordinarily expect collectors to dispose of the contents, not examine and disclose them.

The dissent disputed the majority’s suggestion that theoretical accessibility to animals or scavengers eliminated privacy. A homeowner does not meaningfully invite public inspection merely by using the only practical method of municipal waste collection. Nor, the dissent argued, should limited conveyance to a collector be treated as permission for police examination.

The dissent’s sensitivity-based reasoning has renewed force in an era of DNA recovery, pharmaceutical analysis, smart waste systems, and data aggregation. A discarded item may now reveal far more than was technologically feasible in 1988.

Continuing Significance

Greenwood remains controlling under the federal Fourth Amendment when garbage is left for collection outside the curtilage. It is frequently applied to curbside trash pulls used to corroborate narcotics investigations. But officers must determine exactly where the container was located. A bag or bin within the curtilage, beside a garage, behind a fence, or in an area not open to collectors or the public may require a different analysis, particularly after Jardines and Collins.

State law is equally important. State supreme courts may recognize a privacy interest in household refuse under state constitutions, and statutes or municipal rules may restrict access to containers. The federal holding does not pre-empt those protections.

Modern forensic capability also complicates application. Physical inspection for visible evidence is one thing; extracting DNA, using chemical analysis, or building profiles from repeated waste collection may raise distinct questions. Courts may consider whether the method reveals biological or informational details qualitatively different from ordinary rummaging. Even where Greenwood applies, collection, retention, and secondary use should be governed by policy.

What Greenwood Does Not Hold

Greenwood does not authorize entry into curtilage to seize trash. It does not determine the legality of searching refuse before it has been exposed for collection or after a resident has taken steps to keep it inaccessible. It does not override state constitutional protections, trespass law, sanitation ordinances, or agency policy.

The case also does not decide whether advanced forensic testing of discarded biological material is constitutionally identical to visually inspecting ordinary trash. Nor does it stand for the proposition that all information conveyed to any third party loses Fourth Amendment protection; Carpenter and Chatrie reject such a mechanical rule for sensitive digital location data.

Shield Practice Notes

Before conducting a trash pull, officers should photograph or otherwise document the container’s location, accessibility, collection schedule, and relationship to the home’s curtilage. Avoid crossing fences, gates, driveways, side yards, or other protected areas without a warrant or recognized exception.

Confirm state constitutional and statutory law. Some jurisdictions require greater protection than Greenwood. Policies should specify who may retrieve refuse, how the chain of custody is preserved, and whether the collector is acting within ordinary collection authority.

When analysis extends beyond ordinary inspection—such as DNA profiling, toxicology, or repeated pattern collection—obtain legal review. Agencies should define permissible testing, retention, database entry, and secondary use. The practical ability to extract sensitive information may exceed what the Greenwood Court considered.

Key Quotations

Related Authorities

Primary Source

Official United States Reports opinion

Editorial note: This practitioner resource is educational and does not replace jurisdiction-specific legal advice. Agencies should verify subsequent history, controlling circuit and state authority, and current statutes before operational reliance.