Warshak v. United States

The government (defendant) obtained a court order under the Stored Communications Act directing Warshak's (plaintiff) internet service provider to turn over the contents of his email account without a warrant supported by probable cause; Warshak sued, arguing the compelled disclosure violated his Fourth Amendment rights, while the government argued a lower reasonable-relevance standard applied because email users have no legitimate expectation of privacy given providers' contractual access rights.