What is the primary purpose of the Fourth Amendment?

The primary purpose of the Fourth Amendment is to protect individuals from unreasonable searches and seizures. This amendment is a fundamental part of American constitutional law that safeguards citizens' privacy and security by ensuring that the government cannot arbitrarily intrude into personal space or property without proper justification. It requires law enforcement to have probable cause and, in most cases, a warrant before conducting searches or making seizures, thus placing checks on governmental power.

While the other options touch on aspects related to law enforcement and individual rights, they do not encapsulate the essence of the Fourth Amendment as comprehensively as the correct choice. The protection against unlawful detentions and the guidelines surrounding arrests and police conduct are important in their own right, but they are not the specific focus of the Fourth Amendment. Instead, the amendment specifically addresses the need for reasonable grounds and legal procedures before the government can intrude upon an individual's privacy and possessions.