No expectation of privacy is maintained for property and personal effects held open to the public. Things visible in "plain view" for a person of ordinary and unenhanced vision are entitled to no expectation of privacy and thus no Fourth Amendment protection. Items lying in someone's backseat, growing in someone's outdoor garden, or discarded in someone's curb-side garbage all fall within this category. However, items seen only through enhanced surveillance, such as through high-powered or telescopic lenses, may be subject to the strictures of the Fourth Amendment. Public records, published phone numbers, and other matters readily accessible to the general public enjoy no expectation of privacy. Similarly, the Supreme Court has said that individuals do not possess an expectation of privacy in their personal characteristics (see United States v. Dionisio, 410 U.S. 1 [1973]). Thus, the police may require individuals to give handwriting and voice exemplars, as well as hair, blood, DNA, and fingerprint samples, without complying with the Fourth Amendment's requirements.

Finally, to raise a Fourth Amendment objection to a particular search or seizure, a person must have "standing" to do so. Standing in this context means that the rights guaranteed by the Fourth Amendment are personal and may not be asserted on behalf of others. Thus, a passenger may not generally object to a police search of the owner's car and a houseguest may not generally object to a search of the homeowner's premises. These rules can become murky, however, as when a houseguest is actually living with the homeowner or owns things stored on the owner's premises.