Whether the Fourth Amendment applies to searches and seizures by public employers of their employees' workplace property.
Holding
Yes. Public employers are subject to the Fourth Amendment when they search or seize an employee's private property, although the governing reasonableness standard depends on the workplace context.
Reasoning
The Fourth Amendment restrains government action outside the criminal-law setting as well as within it. A governmental intrusion affects an individual's privacy whether the government is investigating crime, enforcing regulations, or managing its own workforce. Public employees therefore do not forfeit Fourth Amendment protection merely by working for the government.
The Court rejected the argument that a government employee can never hold a reasonable expectation of privacy at work. The relevant question is instead whether, in light of the actual conditions and practices of the workplace, the employee had an expectation of privacy that society is prepared to recognize as reasonable.