Bill of Rights -- Article IV

The right of the people to be secure in their 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 person or things to be seized.

Privacy. This means no one has the right to go poking around in your residence unless they have a good reason, know exactly what they are looking for, and can convince some judge that they have probable cause to believe that a crime is taking place and the judge issues them a search warrant. And unless that is the case, what you do there is nobody's damned business.

Constitutional guarantee.

Don Firth