New Study Challenges Supreme Court's Fourth Amendment Curtilage Rulings: Public Perceptions vs. Legal Doctrine

Legal scholars have released a draft article challenging the Supreme Court’s interpretation of Fourth Amendment protections outside the home, arguing that judicial assumptions about public perceptions of privacy do not align with reality.

The article, titled "Popular Conceptions of Fourth Amendment Curtilage", is co-authored by Matthew Kugler and is forthcoming in the Michigan Law Review. It revisits an idea first explored by the lead author in a 2018 post on the Volokh Conspiracy blog.

What Is Curtilage and Why Does It Matter?

The Fourth Amendment protects individuals from unreasonable searches and seizures, extending privacy protections beyond the walls of a home to an area known as curtilage. The Supreme Court defines curtilage as the area immediately surrounding a home where privacy expectations are heightened. Police generally need a warrant to enter curtilage unless the entry falls under an implied license—a legal doctrine allowing limited access to certain areas without explicit permission.

According to the Court, the boundaries of curtilage and implied license are determined by prevailing social norms, or what it calls "the habits of the country." Judges are expected to intuit these shared attitudes when applying curtilage doctrine. However, the authors argue that this approach lacks empirical validation.

Empirical Studies Reveal Public Misunderstandings of Legal Doctrine

To test public perceptions, the authors conducted three empirical studies, each involving 600 participants. The surveys assessed whether members of the public could correctly identify curtilage boundaries and implied license scenarios.

• Study 1 & 2: Participants viewed images of properties with an officer present and were asked whether the officer was inside or outside the curtilage.
• Study 3: Participants evaluated hypothetical home-visit scenarios to determine if each visit fell within or outside the implied license.

The studies covered facts from Supreme Court cases and prominent lower court decisions to compare public opinion with judicial rulings.

Key Findings: Courts Misjudge Curtilage but Get Implied License Right

The research uncovered a significant gap between legal doctrine and public expectations:

• Curtilage Misunderstood: Courts limit curtilage to areas immediately surrounding the home. However, the public views the entire property as private space. Most participants believed privacy extended to all parts of a property, not just the immediate vicinity of the home.
• Implied License Aligns with Law: Public perceptions of implied license closely matched existing case law. Courts have accurately described when police can enter a property without a warrant under this doctrine.

The authors conclude that courts have misunderstood curtilage but have correctly interpreted implied license. They recommend that Fourth Amendment law either justify current curtilage protections on new grounds or expand curtilage boundaries to reflect public expectations.

Call for Feedback on Draft Article

The authors emphasize that this is a draft article and welcome feedback from legal scholars, practitioners, and the public. Comments can be submitted to refine the research before publication in the Michigan Law Review.