What was determined in Illinois v McArthur regarding the police and searches?

In Illinois v. McArthur, the court ruled that police officers have the authority to secure a crime scene and prevent a suspect from entering or leaving that scene while they obtain a warrant. This decision established that a temporary detention of a suspect is permissible when officers have reasonable suspicion to believe that evidence related to a crime is present in a residence. The ruling emphasized the balance between an individual's Fourth Amendment rights against unreasonable searches and seizures and the police's need to effectively investigate criminal activity.

The court held that, in circumstances where officers are trying to prevent the destruction of evidence, they can lawfully hold a suspect for a limited period to allow time to secure a warrant, thus providing a legal pathway for conducting a search without immediate consent or probable cause at the moment of the initial encounter.