Probable cause means reasonable suspicion you committed a crime or that there is evidence at a location. The Fourth Amendment's rule against unreasonable search and seizures means that police may not search you or your property unless one of the following is true:.The Fourth Amendment permits the officer to search the vehicle's interior so long as they have probable cause. Peace officers must demonstrate that probable cause exists to search a specific place for specific property or contraband which will be used as evidence. According to the fourth amendment, the warrant requirement is that there must be probable cause before it can be issued. Essentially, police are required to have probable cause to search you or your property. The Fourth Amendment protects United States citizens from "unreasonable searches and seizures" without probable cause. The Fourth Amendment requires the government to obtain a warrant based on probable cause to conduct a legal search and seizure. Or probable cause in the absence of a warrant. 67 But in 1967, the.