Which amendment has been interpreted to imply a right to privacy?

The Ninth Amendment is interpreted to imply a right to privacy because it acknowledges that the enumeration of certain rights in the Constitution does not mean that other rights not specifically mentioned are not protected. This amendment suggests that individuals have rights that extend beyond those explicitly listed, and through various Supreme Court rulings, such as Griswold v. Connecticut in 1965, it has been established that the Constitution protects an individual's privacy concerning personal decisions, such as those related to marriage and family planning.

The emphasis on unenumerated rights supports the idea that personal privacy is a fundamental aspect of liberty that should be recognized and protected, even if not explicitly stated in the Constitution. This principle has been crucial in developments regarding privacy rights across various legal contexts.