Final answer:
A prosecution for capital offenses or those punishable by life imprisonment must be initiated by a Grand Jury indictment or presentment, as required by the Fifth Amendment, except in military cases during times of war or public danger.
Step-by-step explanation:
A prosecution for an offense punishable by death, or for an offense punishable by life imprisonment, shall be instituted by a Grand Jury presentment or indictment. The Fifth Amendment to the U.S. Constitution requires that no person shall be held to answer for a capital or otherwise infamous crime unless on such an indictment or presentment, with the exception of cases arising in the military forces or the militia during times of war or public danger. It is further established by the Sixth Amendment that criminal trials shall be by jury and held in the state where the crime was committed, unless not committed within any state, in which case Congress may direct the location.