When a San Bernardino criminal case search occurs, police have to follow the Fourth Amendment and 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.The Fourth Amendment protects against unreasonable searches and seizures; these constitutional protections fully apply to cell phone searches. In addition to the requirements of the California Rules of Court, no amendment of the Local. Los Angeles criminal lawyers review California's stop-and-frisk law on police searches based on the Fourth Amendment of the U.S. Constitution and probable cause Probable cause means that the police officer can describe specific and detailed facts that suggest a crime is being committed. Probable cause means that the police officer can describe specific and detailed facts that suggest a crime is being committed. Judges should only issue search warrants for residences based on "probable cause" to believe a crime has occurred and the search will yield evidence about it.16. The Fourth Amendment requires the government to obtain a warrant based on probable cause to conduct a legal search and seizure. The Fourth Amendment protects you from unreasonable searches and seizures.