 The Court reasoned that although a defendant has no generalized constitutional right to remain silent at a psychiatric examination limited to the issues of sanity or competency, full Miranda warnings must be given with respect to testimony concerning future dangerousness.Thomas Barefoot (February 23, 1945 - October 30, 1984) was convicted of the murder of a police officer.The same Texas jury determined, in the sentencing phase of the trial, whether Barefoot should receive the death penalty.