The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people.
The Ninth Amendment states that the rights in the Constitution and the Bill of Rights are not the only rights retained by the people.
The man in this video claims that prohibition of drugs violates the 9th Amendment because the government is denying the right of citizens to take whatever drug they so choose. I thought the guy was really funny.
This video features a much more lengthy lecture (October 15, 2008) about natural rights, enumerated rights, and the Ninth Amendment by Michael W. McConnell, Presidential Professor of Law and Judge of 10th U.S. Circuit Court of Appeals.