Probable Cause
"Probable cause" generally refers to the requirement in criminal law that police have adequate reason to arrest someone, conduct a search, or seize property relating to an alleged crime. This requirement comes from the Fourth Amendment of the U.S. Constitution, which states that:
"The 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 searched."