Terry v. Ohio, 392 U.S. 1 (1968), was a landmark U.S. Supreme Court decision in which the court ruled that it is constitutional for American police to "stop and frisk" a person they reasonably suspect to be armed and involved in a crime. Specifically, the decision held that a police officer does not violate the Fourth Amendment to the U.S. Constitution's prohibition on unreasonable searches and seizures when questioning someone even though the officer lacks probable cause to arrest the person, so long as the police officer has a reasonable suspicion that the person has committed, is committing, or is about to commit a crime. The court also ruled that the police officer may perform a quick surface search of the person's outer clothing for weapons if they have reasonable suspicion that the person stopped is "armed and presently dangerous." This reasonable suspicion must be based on "specific and articulable facts," and not merely upon an officer's hunch.
United States v. Place, 462 U.S. 696 (1983), is a decision by the Supreme Court of the United States in which the Court held that it does not violate the Fourth Amendment to the U.S. Constitution for a trained police dog to sniff of a person's luggage or property in a public place.
United States v. Matlock, 415 U.S. 164 (1974), was a Supreme Court of the United States case in which the Court ruled that the Fourth Amendment prohibition on unreasonable searches and seizures was not violated when the police obtained voluntary consent from a third party who possessed common authority over the premises sought to be searched. The ruling of the court established the "co-occupant consent rule," which was later explained by Illinois v. Rodriguez, 497 U.S. 177 (1990) and distinguished later by Georgia v. Randolph (2006), in which the court held that a third party could not consent over the objections of a present co-occupant, and Fernandez v. California (2014), where the court held when the objecting co-resident is removed for objectively reasonable purposes, the remaining resident may validly consent to search.
Illinois v. Rodriguez, 497 U.S. 177 (1990), is a U.S. Supreme Court case dealing with the issue of whether a warrantless search conducted pursuant to third party consent violates the Fourth Amendment when the third party does not actually possess common authority over the premises.
Pickering v. Board of Education, 391 U.S. 563 (1968), was a case in which the Supreme Court of the United States held that in the absence of proof of the teacher knowingly or recklessly making false statements the teacher had a right to speak on issues of public importance without being dismissed from their position. The case was later distinguished by Garcetti v. Ceballos, where the Court held that statements by public employees made pursuant to their employment have no First Amendment protection.
Illinois v. Caballes, 543 U.S. 405 (2005), is a decision by the Supreme Court of the United States in which the Court held that the use of a drug-sniffing police dog during a routine traffic stop does not violate the Fourth Amendment to the U.S. Constitution, even if the initial infraction is unrelated to drug offenses.
Board of Education v. Earls, 536 U.S. 822 (2002), was a case by the Supreme Court of the United States in which the Court held, 5–4, that it does not violate the Fourth Amendment to the U.S. Constitution for public schools to conduct mandatory drug testing on students participating in extracurricular activities.
Knowles v. Iowa, 525 U.S. 113 (1998), was a decision by the United States Supreme Court which ruled that the Fourth Amendment prohibits a police officer from further searching a vehicle which was stopped for a minor traffic offense once the officer has written a citation for the offense.
Ferguson v. City of Charleston, 532 U.S. 67 (2001), is a United States Supreme Court decision that found Medical University of South Carolina's policy regarding involuntary drug testing of pregnant women to violate the Fourth Amendment. The Court held that the search in question was unreasonable.
Witherspoon v. Illinois, 391 U.S. 510 (1968), was a U.S. Supreme Court case where the court ruled that a state statute providing the state unlimited challenge for cause of jurors who might have any objection to the death penalty gave too much bias in favor of the prosecution.
Florida v. Royer, 460 U.S. 491 (1983), was a U.S. Supreme Court case dealing with issues involving the Fourth Amendment. Specifically, the case establishes a firm line in cases where police conduct search and seizure without a warrant. The court ruled that, while it is legal for authorities to target and approach a person based on their behavior, absent more, they cannot detain or search such individual without a warrant.
United States v. Martinez-Fuerte, 428 U.S. 543 (1976), was a decision of the United States Supreme Court that allowed the United States Border Patrol to set up permanent or fixed checkpoints on public highways leading to or away from the Mexican border and that the checkpoints are not a violation of the Fourth Amendment.
Menominee Tribe v. United States, 391 U.S. 404 (1968), is a case in which the Supreme Court ruled that the Menominee Indian Tribe kept their historical hunting and fishing rights even after the federal government ceased to recognize the tribe. It was a landmark decision in Native American case law.
Schneckloth v. Bustamonte, 412 U.S. 218 (1973), was a U.S. Supreme Court case that ruled that in a case involving a consent search, although knowledge of a right to refuse consent is a factor in determining whether a grant of consent to a search was voluntary, the state does not need to prove that the person who granted consent to search knew of the right to refuse consent under the Fourth Amendment.
Florida v. Jimeno, 500 U.S. 248 (1991), was a U.S. Supreme Court case involving the exclusionary rule of evidence under the Fourth Amendment.
Fernandez v. California, 571 U.S. 292 (2014), was a U.S. Supreme Court case that explored the limits of Georgia v. Randolph, a 2006 case that held that consent to search a dwelling is invalid in the presence of an objecting co-resident. Fernandez, however, held that when the objecting co-resident is removed for objectively reasonable purposes, the remaining resident may validly consent to search.
United States v. Watson, 423 U.S. 411 (1976), was a case decided by the Supreme Court of the United States that decided that a warrantless arrest in public and consenting to a vehicle search did not violate the Fourth Amendment.
Walker v. Texas Division, Sons of Confederate Veterans, 576 U.S. 200 (2015), was a United States Supreme Court case in which the Court held that license plates are government speech and are consequently more easily regulated/subjected to content restrictions than private speech under the First Amendment.
Birchfield v. North Dakota, 579 U.S. 438 (2016) is a case in which the Supreme Court of the United States held that the search incident to arrest doctrine permits law enforcement to conduct warrantless breath tests but not blood tests on suspected drunk drivers.
Bruton v. United States, 391 U.S. 123 (1968), is a 1968 United States Supreme Court ruling in which the Court held that a defendant was deprived of his rights under the Confrontation Clause if a confession by his codefendant was introduced in their joint trial, regardless of whether the jury received instructions only to consider it against the confessor. This has become known as the Bruton rule. The case overruled Delli Paoli v. United States (1957).
