Criminal Procedure (Fourth Amendment)
585 U.S. ___, 138 S. Ct. 2206, 201 L. Ed. 2d 507 (2018) (U.S. Supreme Court)
Study notes for Carpenter v. United States: professor notes, cold call prep, exam angles, and memory aids.
Historical cell-site location information is protected under the Fourth Amendment and requires a warrant supported by probable cause.
In Carpenter v. United States, the Supreme Court addressed the intersection of modern technology and the Fourth Amendment's protection against unreasonable searches. The Court emphasized that obtaining historical cell-site location information (CSLI) constitutes a search under the Fourth Amendment, requiring a warrant supported by probable cause. This ruling is pivotal as it underscores the importance of safeguarding personal privacy in an era where technology tracks our movements critically. The decision also reflects the Court's recognition that the accumulation of data over time reveals sensitive personal information, which must be protected under constitutional standards.
Professors may highlight the dissenting opinions as well, illustrating the legal and cultural divide on how technological advancements challenge existing legal frameworks. It is crucial for students to understand not just the majority opinion but also the implications of the dissent in future cases concerning digital privacy and the Fourth Amendment.
CELL: Cell data is a Search under the Fourth.
| Case | Distinction |
|---|---|
| United States v. Jones | In Jones, the Court held that using a GPS device placed on a vehicle constituted a search, reinforcing the notion that physical intrusion is also a search, while Carpenter focuses on digital data without physical trespass. |
| Smith v. Maryland | Smith established the third-party doctrine, which permitted warrantless acquisition of phone numbers dialed from a landline, differing from Carpenter by emphasizing user consent given to providers, which does not apply to historical CSLI. |
Requiring a warrant for CSLI protects individual privacy rights in an age of pervasive surveillance and helps restrain government overreach.
Imposing a warrant requirement could hinder law enforcement's ability to effectively investigate crimes and diminish public safety.
Carpenter v. United States often appears on exams in discussions surrounding the Fourth Amendment and digital privacy. Students should be prepared to analyze the decision's implications for warrant requirements and the evolving interpretation of 'search' in the context of technology.