The open-fields doctrine (also open-field doctrine or open-fields rule), in the U.S. law of criminal procedure, is the legal doctrine that a "warrantless search of the area outside a property owner's curtilage" does not violate the Fourth Amendment to the United States Constitution. However, "unless there is some other legal basis for the search," such a search "must exclude the home and any adjoining land (such as a yard) that is within an enclosure or otherwise protected from public scrutiny."