Exigent circumstances; Plain view; Search incident to arrest; Consent; Automobile exceptions; Special needs. 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 most obvious ones are a consent to search, a search incident to a lawful arrest, and reasonable searches associated with vehicle stops. The Fourth Amendment's rule against unreasonable searches and seizures mean the police cannot search you or your vehicle unless one of the following is true. We review the border search exception, which allows searches at the border without a search warrant, probable cause or reasonable suspicion. The Fourth Amendment is one of the most important of the Bill of Rights. Other courts addressing Fifth Amendment protections for biometric features. 3d190; League for Protection of Oakland's Architectural and Historic Resources v. City of Oakland (1997) 52 Cal.App. Violate the Fourth Amendment right against unreasonable searches and seizures, resulting in the suppression of evidence.