Searches and Seizures What the Fourth Amendment Allows

Warrants for Digital Data

A search warrant is a legal document issued by a judge or a magistrate, giving law enforcement officials the authority to search a particular property or area for specific evidence related to a crime (Kerr, 2005). Its primary purpose is to balance the individual's right to privacy and the state's need to conduct investigations to enforce the law. The legal threshold for obtaining a search warrant includes establishing a probable cause and providing detailed information about the person, place, or items to be searched or seized.

There can be potential complications in obtaining a search warrant. First, the requirement to establish probable cause can pose challenges because it involves demonstrating to a judge or magistrate that a crime has likely been committed and that evidence of this crime can be found in the place to be searched. However, sometimes the evidence available is circumstantial or ambiguous, which makes it difficult to establish probable cause (Knutsen, 2003).

Second, the particularity requirement, which means the warrant must describe specifically where law enforcement officials can search and what they are searching for, can also be challenging. In the case of digital evidence, defining the place to be searched might be problematic, especially if the data is stored in the cloud or on a server located in another jurisdiction.

Third, there might be issues with the scope of the search. If during the search, law enforcement officials come across evidence not mentioned in the warrant but related to a different crime, they might face a dilemma of whether they can seize this evidence legally.

The Fourth Amendment of the United States Constitution sets forth the requirements for obtaining a search warrant. It states that "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" (Wasserstrom, 1988). Establishing probable cause is the first step. Law enforcement officials must present evidence to a judge or magistrate showing it is more likely than not that a crime has been committed and that evidence of this crime can be found in the location to be searched. Next, the probable cause must be supported by an oath or affirmation. The information provided to the court must be truthful and made under the penalty of perjury. Law enforcement officials usually accomplish this by writing and signing an affidavit explaining the evidence supporting probable cause. Lastly, the law enforcement officials must specifically describe the place to be searched and the items or persons to be seized. This description prevents the issuance of overly broad or general warrants and protects individuals from unreasonable searches and seizures.

Once a search warrant is obtained, several steps are followed until the digital evidence is presentable in court. First, law enforcement officials execute the warrant, which may involve seizing physical devices or accessing digital data remotely. Then, digital forensic experts analyze the seized data while preserving its original state, often creating an exact copy or "image" of the data for analysis, ensuring the original is unchanged. Maintaining a strict chain of custody for the digital evidence is crucial throughout this process. Every instance of access, transportation, storage, and transformation of the evidence must be documented to establish its integrity and authenticity. The last step is the digital evidence is presented in court. This usually involves an expert witness explaining the evidence, its relevance to the case, and the procedures used to extract and preserve it. This is crucial as it establishes that the digital evidence was obtained legally and is reliable.

The Plain View Doctrine and Exigent Circumstances are two concepts that can provide exceptions to the search warrant requirement under certain conditions, and they can also apply to digital evidence. The Plain View Doctrine holds that if law enforcement officers are lawfully present at a location and they see incriminating evidence that is immediately apparent and in plain view, they can seize it without a warrant (Chang, 2007). For this doctrine to apply, three requirements must be met:

1. The officer must be lawfully present at the place where the evidence can be plainly viewed.

2. The officer must have a lawful right of access to the object.

3. The incriminating character of the object must be immediately apparent.

A scenario in which an officer may claim the Plain View Doctrine applies to digital evidence could be when an officer is responding to a domestic disturbance call at a house. While talking to the residents, the officer sees an open laptop with an active email thread discussing a recent bank hacking. Here, the officer may seize the laptop under the Plain View Doctrine.

However, a counter-argument in court might be that the "incriminating character" of the email was not immediately apparent. The defendant might argue that the officer had to take additional steps, such as reading the email thread, to realize its significance, thereby exceeding the scope of the Plain View Doctrine.

The Exigent Circumstances Doctrine is a legal principle that allows law enforcement to conduct a search without a warrant if there are urgent or emergency circumstances that pose a threat to public safety or risk the destruction of evidence. These might include: