The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated. While there was probable cause for arrest, the Fourth Amendment protects against unreasonable seizures as well as unreasonable searches.What Does the Fourth Amendment Mean? Police officers may seize evidence of a crime in certain situations without a warrant. First, the consent must be voluntarily given. If you consent to a search, police officers do not need to obtain a warrant. A search or seizure is generally considered to be unreasonable without a warrant, subject to only a few exceptions. In one case in Ohio, police did not have a warrant when they searched and discovered drugs and contraband inside an automobile. School officials need not obtain a warrant before conducting a search, nor must they have "probable cause. " However, the search must be reasonable.