Summary

William J. Brennan, Jr. Grady v. Corbin — Opinion of the Court

Thus, a subsequent prosecution must do more than merely survive the Blockburger test. As we suggested in Vitale, the Double Jeopardy Clause bars any subsequent prosecution in which the government, to establish an essential element of an offense charged in that prosecution, will prove conduct that constitutes an offense for which the defendant has already been prosecuted. [11] This is not an "actual evidence" or "same evidence" test. [12] The critical inquiry is what conduct the State will prove, not the evidence the State will use to prove that conduct.
Source: Wikisource

William J. Brennan, Jr. Grady v. Corbin — Opinion of the Court

The two prosecutions were not for the "same offense" under Blockburger since, as a statutory matter, felony murder could be established by proof of any felony, not just robbery, and robbery with a firearm did not require proof of a death. Nevertheless, because the State admitted that " 'it was necessary for all the ingredients of the underlying felony of Robbery with Firearms to be proved' " in the felony-murder trial, the Court unanimously held that the subsequent prosecution was barred by the Double Jeopardy Clause.
Source: Wikisource

William J. Brennan, Jr. Grady v. Corbin — Opinion of the Court

The underlying idea, one that is deeply ingrained in at least the Anglo-American system of jurisprudence, is that the State with all its resources and power should not be allowed to make repeated attempts to convict an individual for an alleged offense, thereby subjecting him to embarrassment, expense and ordeal and compelling him to live in a continuing state of anxiety and insecurity.
Source: Wikisource

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