Or Perhaps the 4th Amendment:
"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."
This is the so-called "Right to Privacy" that libertarians and liberals alike believe should be granted to everyone who does just about anything behind closed doors. But then, there is the "probable cause" clause, isn't there? So, laws in favor of some things and against others - "meddling" - are not addressed here.