"The right of the people to be secure in their persons, HOUSES, papers, and effects, against unreasonable SEARCHES and seizures, shall not be violated; and no warrants shall issue, but upon probable cause, supported by oath or affirmation, and particularly describing the place to be searched and the persons or things to be seized."
Amendment Four, Constitution of the United States. [emphases mine]
Here in the City of Geneva, Code Enforcement enters all rental properties every year under the guise of health and welfare.
The are allegedly looking for electrical hazzards, structural problems and working smoke detectors.
Last year I was present when the came by. The "inspector" took note of my gun collection and got very upset when I told him that none of his business and he needed to move along with his day (read - get to work and stop milking it.)