Keith Mack
Probable cause is a requirement found in the Fourth Amendment that must usually be met before police make an arrest, conduct a search, or obtain a warrant. Probable cause is a higher standard than reasonable suspicion, but weaker than the requirement of evidence to secure a criminal conviction. Probable cause exists when there is a fair probability that a search will result in evidence of a crime being discovered, or when a reasonable person would believe that a crime was in the process of being committed, had been committed, or was going to be committed.
| Characteristics | Values |
|---|---|
| Definition | Probable cause means that a reasonable person would believe that a crime was in the process of being committed, had been committed, or was going to be committed. |
| Application | Probable cause is a requirement found in the Fourth Amendment that must usually be met before police make an arrest, conduct a search, or receive a warrant. |
| Search warrant | To obtain a search warrant, the court must consider whether, based on the totality of the information, there is a fair probability that contraband, evidence, or a person will be found in a particular place. |
| Arrest warrant | Probable cause is the information sufficient to warrant a prudent person's belief that the wanted individual committed a crime or that evidence of a crime or contraband would be found in a search. |
| Valid arrest | To make a valid arrest, the police must have probable cause, which is a different standard from the reasonable suspicion standard required to make an initial stop. |
| Arrest without warrant | Probable cause can justify a warrantless arrest, but a person arrested without a warrant must be brought before a competent authority shortly after the arrest for a prompt judicial determination of probable cause. |
| Search without warrant | Probable cause can justify a warrantless search, but a search without voluntary consent may require a warrant. |
| Exclusionary rule | A lack of probable cause will render a warrantless arrest invalid, and any evidence resulting from that arrest will have to be suppressed. |
| Probation | When a person is on probation, the standard required for a search to be lawful is lowered from "probable cause" to "reasonable grounds" or "reasonable suspicion". |
| Immigration law | In U.S. immigration law, the term "reason to believe" is equivalent to the probable cause standard of criminal law. |
| European law | In the criminal code of some European countries, probable cause is a higher level of suspicion than "justifiable grounds". |
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What You'll Learn
Probable cause and the Fourth Amendment
The Fourth Amendment of the U.S. Constitution protects people's right to privacy and freedom from unreasonable intrusions by the government. It states that:
> [t]he 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.
Probable cause is a legal requirement that must be met before a police officer can make an arrest, conduct a search, seize property, or obtain a warrant. It exists when a police officer has a reasonable belief in the guilt of a suspect or the existence of evidence based on the facts and information available prior to the arrest or search.
For example, in United States v. Ventresca, an affidavit by a law enforcement officer asserting his belief that an illegal distillery was being operated at a certain location, based on his own observations and those of his fellow investigators, was held to be sufficient to constitute probable cause.
Probable cause may be demonstrated by live, sworn testimony or by affidavit. An affidavit based on hearsay can be used as the basis for issuing a search warrant, so long as the circumstances in their totality establish probable cause.
In the context of the Fourth Amendment, a seizure of a person occurs when the police's conduct would communicate to a reasonable person that they are not free to ignore the police presence and leave. Two elements must be present to constitute a seizure of a person: a show of authority by the police officer, and submission to that show of authority.
Warrantless searches and seizures are generally prohibited under the Fourth Amendment, unless a specific exception applies. For instance, a warrantless search or seizure may be lawful if an officer has consent to search, if the search is incident to a lawful arrest, if there is probable cause to search and there are exigent circumstances, or if the objects being searched are in plain view.
The extent to which an individual is protected by the Fourth Amendment depends, in part, on the location of the search or seizure. For example, searches and seizures inside a home without a warrant are presumptively unreasonable, but there are exceptions to this rule.
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Probable cause vs reasonable suspicion
The terms "probable cause" and "reasonable suspicion" are often confused and misused, but they have distinct legal implications and play a crucial role in the criminal justice system. Both concepts are used by law enforcement officers to justify their actions. Understanding the difference between these concepts is essential for comprehending how legal standards protect your individual rights.
Probable cause is a legal requirement that must be met before a police officer can make an arrest, conduct a search, seize property, or obtain a warrant. Probable cause generally means that a reasonable person would believe that a crime was in the process of being committed, had been committed, or was going to be committed. It requires more than a mere suspicion but far less evidence than that needed to support a conviction. Courts often find probable cause when there is a reasonable basis for believing that a crime may have been committed or when evidence of a crime is present in the place to be searched. Probable cause can be contested by showing that the arresting officer did not have sufficient factual grounds to believe a crime was committed.
Reasonable suspicion, on the other hand, is a legal standard that allows law enforcement officers to briefly stop and question individuals based on specific facts or circumstances that suggest criminal activity. It is a step before probable cause. It requires something more than an "unarticulated hunch" and must be based on objective facts and rational inferences. Reasonable suspicion does not allow for the searching of a person or a vehicle unless they are on school property. It is important to note that reasonable suspicion does not allow for the obtaining of an arrest or search warrant.
In summary, probable cause justifies a more thorough search or an arrest, while reasonable suspicion justifies an investigative stop, which may include a brief detention and questioning. Probable cause requires a substantial degree of certainty, while reasonable suspicion requires less substantial evidence. These standards are designed to balance law enforcement's need to maintain public safety with an individual's constitutional rights.
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Probable cause and arrest warrants
In criminal law, probable cause is a requirement that must be met before a police officer can make an arrest, conduct a search, seize property, or obtain a warrant. Probable cause is important in two key aspects of criminal law: police must establish probable cause before searching a person or property, and before they arrest someone.
Probable cause can be demonstrated by live, sworn testimony or by affidavit. An affidavit based on hearsay, which could not be used as evidence in a criminal trial, can be used as the basis for issuing a search warrant, as long as the circumstances in their totality establish probable cause. A judge may issue a search warrant if the affidavit in support offers sufficient, credible information to establish probable cause. Information from victims or witnesses, if included in an affidavit, may be important factors in establishing probable cause.
In some cases, a police officer can arrest someone without a warrant based on probable cause. In such cases, a judge will review the evidence within 24 hours of the arrest to determine whether probable cause existed. In other cases, an officer can seek an arrest warrant signed by a judge, who determines that there is probable cause in the case.
The concept of probable cause is evolving and sometimes inconsistent. It is not defined in Florida, but it is generally understood to mean that the evidence is more likely than not that the person committed the crime. The evidence can come in the form of an affidavit, complaint, or deposition of a law enforcement officer.
In Australia, reasonable and probable grounds are a prerequisite of most police powers, including arresting without a warrant, searching without a warrant, requesting disclosure of identity, and investigating terrorist activity. The concept is derived from a hypothetical reasonable person, a standard by which a law is explained to a jury.
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Probable cause and search warrants
In criminal law, probable cause is a requirement that must be met before a police officer can make an arrest, conduct a search, seize property, or obtain a warrant. Probable cause is a flexible concept, and its existence depends on the totality of the circumstances, including all the information that the arresting officers know or reasonably believe at the time of the arrest.
Probable cause may be demonstrated by live, sworn testimony or by affidavit. An affidavit based on hearsay can be used as the basis for issuing a search warrant, as long as the circumstances establish probable cause. A judge may issue a search warrant if the affidavit in support of the warrant provides sufficient credible information to establish probable cause. Information from victims or witnesses, if included in an affidavit, may be important factors in establishing probable cause.
In the United States, the Fourth Amendment requires that any arrest be based on probable cause, even when made pursuant to an arrest warrant. Courts usually find probable cause when there is a reasonable basis for believing that a crime may have been committed (for an arrest) or when evidence of a crime is likely to be found in the place to be searched (for a search).
In Australia, reasonable and probable grounds are a prerequisite for police officers to exercise certain powers, including arresting without a warrant, searching without a warrant, requesting disclosure of identity, and investigating terrorist activity. The concept of reasonable and probable grounds is evolving and sometimes inconsistent, depending on the circumstances of a case.
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Probable cause and digital data
The Fourth Amendment of the US Constitution requires probable cause for arrests or obtaining search warrants. Probable cause is a flexible concept, and its interpretation depends on the totality of the circumstances. It generally refers to a reasonable belief that a crime has been or will be committed, or that evidence of a crime will be found in a search.
Probable cause is a requirement for valid police searches under the Fourth Amendment. In the case of digital data, the Supreme Court held in Riley v. California (2014) that police may not search digital information on a cellphone without a warrant, grouping cell phones with traditional items subject to court tests and rules for searches and seizures. However, the inquiry into digital data's interaction with the Fourth Amendment did not end with this case.
The Supreme Court agreed to hear Carpenter v. United States in 2018, a case that further highlights the complexities of probable cause and digital data. Carpenter challenged the Stored Communications Act, which permits phone companies to divulge information when "specific and articulable facts" are relevant to a criminal investigation. Carpenter's complaint argued that his privacy rights were violated when his phone company shared data on his whereabouts with law enforcement without a warrant. This case will likely impact how probable cause applies to data companies sharing user information with law enforcement.
The concept of probable cause is evolving with technological advancements, and courts are interpreting it in the context of digital data and privacy rights. While the Fourth Amendment traditionally applied to physical seizures of tangible property, the inclusion of digital data and electronic devices presents new challenges and considerations for law enforcement and the judicial system.
Probable cause is a critical component of the legal process, and its interpretation in the digital age will continue to shape how law enforcement collects and uses digital evidence while also protecting individuals' privacy and constitutional rights.
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Frequently asked questions
Probable cause is a requirement found in the Fourth Amendment that must usually be met before police make an arrest, conduct a search, or receive a warrant.
Reasonable suspicion is a lower threshold than probable cause. This ruling provides law enforcement with a practical tool to investigate suspicious behaviour without a warrant or probable cause.
Probable cause exists when there is a fair probability that a search will result in evidence of a crime being discovered. It is enough for a police officer to make an arrest if they see a crime being committed.
A probable cause hearing happens together with the defendant's first court appearance after their arrest. The judge will determine whether probable cause supported the arrest. If it did not, law enforcement will not be able to continue holding the defendant in custody if they have not been released.
A judge may issue a search warrant if the affidavit in support of the warrant offers sufficient credible information to establish probable cause. The judge may make a finding of probable cause if they are persuaded by a written statement from the police or prosecution regarding the facts of the case.
