The Third Amendment to the United States Constitution places restrictions on the quartering of soldiers in private homes without the owner's consent, forbidding the practice in peacetime. The amendment is a response to the Quartering Acts passed by the Parliament of Great Britain during the buildup to the American Revolutionary War, which had allowed the British Army to lodge soldiers in public buildings.

Griswold v. Connecticut, 381 U.S. 479 (1965), was a landmark decision of the U.S. Supreme Court in which the Court ruled that the Constitution of the United States protects the liberty of married couples to use contraceptives without government restriction. The case involved a Connecticut "Comstock law" that prohibited any person from using "any drug, medicinal article or instrument for the purpose of preventing conception". The court held that the statute was unconstitutional, and that its effect was "to deny disadvantaged citizens ... access to medical assistance and up-to-date information in respect to proper methods of birth control." By a vote of 7–2, the Supreme Court invalidated the law on the grounds that it violated the "right to marital privacy", establishing the basis for the right to privacy with respect to intimate practices. This and other cases view the right to privacy as "protected from governmental intrusion".