The exclusionary rule prohibits the government from using illegally obtained evidence to prove a criminal defendant's guilt. Searches and seizures inside a home without a warrant are presumptively unreasonable.A motor vehicle may be searched without a warrant if there is probable cause to believe there is contraband or evidence in the vehicle. b. Our constitutional fortress against unwarranted intrusion, the Fourth Amendment, enshrines our right against unreasonable searches. The Fourth Amendment generally requires government officials to obtain an arrest warrant or search warrant to execute a valid search and seizure. The New York State Commission of Investigation does not have the authority to obtain search warrants. Any violation of your Fourth Amendment search and seizure rights could result in complete dismissal of all charges against you. Criminal suspects can voluntarily waive their Fourth Amendment rights and consent to a search of their person or property without a warrant. The search warrant is invalid if it is not grounded in a reasonable belief or fact that justifies the suspicion. In general, police need to have a search warrant in order to conduct a search.