The Fourth Amendment protects us against unreasonable search and seizure. InChimel v Californiathe court held that police officers arresting a person in their home should not search the home without a valid search warrant. In Arizona v Gant the act of police searching a vehicle in case the occupant of the vehicle voluntarily left it is unconstitutional. Exceptions to the Fourth Amendment’s requirement of a warrant must be justified by a concern for officer safety or evidence preservation. The court held that these justifications did not apply in Gant's case because he had left the vehicle on his own free will.