The Fourth Amendment protects against unreasonable searches and seizures. Which statement best describes its warrant requirement?

The Fourth Amendment protects against unreasonable searches and seizures. Which statement best describes its warrant requirement?

• A. No warrants are ever needed
• B. Warrants must be based on probable cause
• C. Warrants are optional for government searches
• D. Warrants are required for all searches regardless of probable cause

Answer: (B)

The key idea is that a warrant, when required, must rest on probable cause. Probable cause means a fair probability—based on facts and circumstances—that evidence of a crime will be found in the place to be searched. A valid warrant is issued by a neutral magistrate and must describe with particularity the place to be searched and the items to be seized. While there are recognized exceptions that allow warrantless searches (such as consent, exigent circumstances, or searches incident to arrest), the general rule is that a warrant must be grounded in probable cause. That’s why the statement that warrants must be based on probable cause is the best description of the warrant requirement.

The key idea is that a warrant, when required, must rest on probable cause. Probable cause means a fair probability—based on facts and circumstances—that evidence of a crime will be found in the place to be searched. A valid warrant is issued by a neutral magistrate and must describe with particularity the place to be searched and the items to be seized. While there are recognized exceptions that allow warrantless searches (such as consent, exigent circumstances, or searches incident to arrest), the general rule is that a warrant must be grounded in probable cause. That’s why the statement that warrants must be based on probable cause is the best description of the warrant requirement.