This entry contains information applicable to United States law only. In international law, the right of ships of war, as regulated by treaties, to examine a merchant vessel during war in order to determine whether the ship or its cargo is liable to seizure.
A hunt by law enforcement officials for property or communications believed to be evidence of crime, and the act of taking possession of this property.
Search and seizure is a necessary exercise in the ongoing pursuit of criminals. Searches and seizures are used to produce evidence for the prosecution of alleged criminals. Under federal, state, and local laws, a police officer may search people and places when the officer has probable cause to suspect criminal activity. This means that the officer must possess sufficient trustworthy facts to believe that a crime has been committed. In some cases, an officer may need only a reasonable suspicion of criminal activity to conduct a limited search. Reasonable suspicion means that the officer has sufficient knowledge to believe that criminal activity is at hand. This level of knowledge is less than that of probable cause, so reasonable suspicion is usually used to justify a brief frisk in a public area. To possess either probable cause or reasonable suspicion, an officer must be able to cite specific articulable facts to warrant the intrusion. Items related to suspected criminal activity found in a search may be taken, or seized, by the officer.
Under the Fourth Amendment, seizure also refers to the taking, or arrest, of persons. An arrest occurs when a police officer takes a person against his or her will for questioning or criminal prosecution. To make an arrest, an officer must have probable cause.
A warrant is not generally required for an arrest, except for an arrest in the home. A seizure may be less than an arrest, such as an investigatory stop. Investigatory stops are used by police to briefly detain, frisk, and question persons in public. This is permissible where an officer has reasonable suspicion to believe that a person has committed or is committing a crime.
Search and seizure law generally refers to the search of persons and places and the seizure of evidence by law enforcement officials. It does not refer to searches carried out by private parties. Evidence of a crime acquired by a private party and given unsolicited to a police officer may be used in a criminal trial. Many searches conducted by private parties — such as drug tests by employers — can be intrusive, but the law provides limited protection from these intrusions.
The police have the power to search and seize, but individuals are protected against arbitrary, unreasonable police intrusions. Freedom from unrestricted search warrants was critical to American colonists. Under England's rule, many searches were unlimited in scope and conducted without justification. Customs officials could enter the homes of colonists at will to search for violations of customs and trade laws, and suspicionless searches were carried out against outspoken political activists. Searches in the colonies came to represent governmental oppression.
To guard against arbitrary police intrusions, the newly formed United States in 1791 ratified the U.S. Constitution's Fourth Amendment, which states,
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
Like much of the Constitution, the Fourth Amendment left ample room for interpretation. Over the years the U.S. Supreme Court has held it to mean that unreasonable searches are prohibited, and that any search conducted by or at the direction of law enforcement personnel without a warrant is unreasonable unless it falls within an established exception.
A search warrant is a judicially approved document that authorizes law enforcement officials to search a particular place. To obtain a search warrant, a police officer must provide an account of information supporting probable cause to believe that evidence of a crime will be found in a particular place or places. The officer must also make a list of the particular places to be searched and the items sought. Finally, the officer must swear to the truthfulness of the information. The officer presents the information in an affidavit to a magistrate or judge, who determines whether to approve the warrant.
An officer may search only the places where items identified in the search warrant may be found. For example, if the only item sought is a snowmobile, the officer may not rummage through desk drawers. Only the items listed in the warrant may be seized, unless other evidence of illegal activity is in plain view. Judges or magistrates may approve a variety of types of searches. The removal of blood from a person's body, a search of body cavities, and even surgery may be approved for the gathering of evidence. Electronic surveillance and phone records may also be used to gather evidence upon the issuance of a warrant.
A warrant is not required for a search incident to a lawful arrest, the seizure of items in plain view, a border search, a search effected in open fields, a vehicle search, an inventory search of an impounded vehicle, and any search necessitated by exigent circumstances. It is also not required for a stop and frisk, a limited search for weapons based on a reasonable suspicion that the subject has committed or is committing a crime. A police officer may also conduct a warrantless search if the subject consents.
In theory, the Fourth Amendment protects a person's right to privacy. Thus, search warrants are required only for items or qualities in which a person has a reasonable expectation of privacy. A person has no reasonable expectation of privacy in things like bank records, vehicle location and vehicle paint, garbage left for collection, handwriting, the smell of luggage, and land visible from a public place; the police may therefore inspect such things without acquiring a warrant.
Administrative agencies may conduct warrantless searches of highly regulated industries, such as strip mining and food service. Federal and state statutes authorize warrantless, random drug testing of persons in sensitive positions, such as air traffic controllers, drug interdiction officers, railroad employees, and customs officials.
The U.S. Supreme Court has approved warrantless, suspicionless searches at roadside sobriety checkpoints. These searches must be carried out in some neutral, articulable way, such as by stopping every fifth car. Warrantless searches of public housing projects have been ruled unconstitutional. Similar searches continue as legislators and police officers test the boundaries of the Fourth Amendment.
Warrant exceptions have been carved out by courts because requiring a warrant in certain situations would unnecessarily hamper law enforcement. For example, it makes little sense to require an officer to obtain a search warrant to seize contraband that is in plain view. However, if the officer has gained unwarranted access to the plain view — for example, by entering a home without permission or a warrant — he may not thereafter seize the contraband.
The law of search and seizure is often more theoretical than practical. In practice, police officers generally seize evidence of illegal activity and leave the parsing of their actions to prosecutors, criminal defense attorneys, and, ultimately, the court. When a judge deems a search unreasonable, she frequently applies the exclusionary rule.
For the entire nineteenth century, a Fourth Amendment violation had little consequence. Evidence seized by law enforcement from a warrantless or otherwise unreasonable search was admissible at trial if the judge found it reliable. This made the Fourth Amendment essentially meaningless to criminal defendants.
In 1914, the U.S. Supreme Court devised a way to enforce the Fourth Amendment. In Weeks v. United States, 232 U.S. 383, 34 S. Ct. 341, 58 L. Ed. 652 (1914), a federal agent conducted a warrantless search for evidence of gambling at the home of Fremont Weeks. The evidence seized in the search was used at trial, and Weeks was convicted. On appeal, the Supreme Court held that the Fourth Amendment barred the use of evidence secured through a warrantless search and seizure. Weeks's conviction was reversed, and thus was born the exclusionary rule.
The warrant requirement and the exclusionary rule are the only judicial checks on law enforcement's power to search and seize. The exclusionary rule is a judicially created remedy used to deter police misconduct in obtaining evidence. Under the exclusionary rule, a judge may exclude incriminating evidence from a criminal trial if there was police misconduct in obtaining the evidence. Without the evidence, the prosecutor may lose the case or drop the charges for lack of proof. This rule provides some substantive protection against illegal search and seizure.
The exclusionary rule was constitutionally required only in federal court until Mapp v. Ohio, 367 U.S. 643, 81 S. Ct. 1684, 6 L. Ed. 2d 1081 (1961). In Mapp, the Court held that the exclusionary rule applied to state criminal proceedings through the Due Process Clause of the Fourteenth Amendment. Before the Mapp ruling, not all states excluded evidence obtained in violation of the Fourth Amendment. After Mapp, a defendant's claim of unreasonable search and seizure became commonplace in criminal prosecutions.
The application of the exclusionary rule has been significantly limited by a good faith exception created by the Supreme Court in United States v. Leon, 468 U.S. 897, 104 S. Ct. 3405, 82 L. Ed. 2d 677 (1984). Under the good faith exception, evidence obtained in violation of a person's Fourth Amendment rights will not be excluded from trial if the law enforcement officer, though mistaken, acts reasonably. For example, if an officer reasonably conducts a search relying on information that is later proved to be false, any evidence seized in the search will not be excluded if the officer acted in good faith, with a reasonable reliance on the information. The Supreme Court has carved out this exception to the exclusionary rule because, according to a majority of the court, the rule was designed to deter police misconduct, and excluding evidence when the police did not misbehave would not deter police misconduct.
A companion to the exclusionary rule is the fruit of the poisonous tree doctrine, established by the Supreme Court in Nardone v. United States, 308 U.S. 338, 60 S. Ct. 266, 84 L. Ed. 307 (1939). Under this doctrine, a court may exclude from trial any evidence derived from the results of an illegal search. For example, assume that an illegal search has garnered evidence of illegal explosives. This evidence is then used to obtain a warrant to search the suspect's home. The exclusionary rule excludes the evidence initially used to obtain the search warrant, and the fruit of the poisonous tree doctrine excludes any evidence obtained in a search of the home.
A criminal defendant's claim of unreasonable search and seizure is usually heard in a suppression hearing before the presiding judge. This hearing is conducted before trial to determine what evidence will be suppressed, or excluded, from trial.
See: Alcohol; Automobiles; Criminal Law; Criminal Procedure; Drugs and Narcotics; Due Process of Law; Mapp v. Ohio; Olmstead v. United States; Plain View Doctrine; Terry v. Ohio; Warren Court; Wiretapping.