This law sets a standard for all search and seizures within the state of Illinois to be carried out with the use of warrants or the presence of 'probable cause. What Does the Fourth Amendment Mean?Illinois search and seizure law springs directly out of the federal constitution 4th Amendment. If the officer does not have probable cause to arrest you, any items found in a search incident to arrest must be suppressed due a Fourth Amendment violation. First, the consent must be voluntarily given. The Fourth Amendment generally requires government officials to obtain an arrest warrant or search warrant to execute a valid search and seizure. An applicant for a warrant must present to the magistrate facts sufficient to enable the officer himself to make a determination of probable cause. The Fourth Amendment effectively says that the police cannot conduct a search without first obtaining a warrant based on probable cause. " A warrantless search means without a warrant and without consent. The search warrant is invalid if it is not grounded in a reasonable belief or fact that justifies the suspicion.