Summary

Portrait of Hugo Black Hugo Black Simmons v. United States (390 U.S. 377…

There is certainly no language in the Fourth Amendment which gives support to any such device to hobble law enforcement in this country. While our Constitution does provide procedural safeguards to protect defendants from arbitrary convictions, that governmental charter holds out no promises to stultify justice by erecting barriers to the admissibility of relevant evidence voluntarily given in a court of justice.
Source: Wikisource

Portrait of Hugo Black Hugo Black Simmons v. United States (390 U.S. 377…

The reason why the Fifth Amendment poses no bar to acceptance of Garrett's testimony is not, therefore, that a promise of benefit is not generally fatal. Rather, the answer is that the privilege against self-incrimination has always been considered a privilege that can be waived, and the validity of the waiver is, of course, not undermined by the inevitable fact that by testifying, a defendant can obtain the 'benefit' of a chance to help his own case by the testimony he gives.
Source: Wikisource

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