In Duvall v. United States, the Supreme Court ruled that a defendant could not be convicted of an offense if they had been pardoned for it before their trial began. The case involved William Duvall who was charged with treason against the United States during the Civil War and subsequently granted a pardon by President Abraham Lincoln in 1863. When he was tried for his alleged crime two years later, he argued that since he had already been pardoned, there was no legal basis to convict him of any wrongdoing. The Supreme Court agreed and held that when a person is pardoned prior to being put on trial, they cannot be found guilty or punished for any crimes related to those charges because such action would violate double jeopardy principles established under the Fifth Amendment of the U.S Constitution which prohibits anyone from being “twice put in jeopardy” for same offence or crime committed by them

In Duvall v. United States, the Supreme Court ruled that a defendant could not be convicted of an offense unless it was specifically stated in the indictment. The dissenting opinion argued that this ruling would lead to too much leniency for defendants and allow them to escape punishment if their actions were not precisely described in the indictment. The dissent further argued that Congress had intended for criminal statutes to apply broadly and should not be limited by technicalities such as those presented in this case. Furthermore, they noted that allowing defendants to avoid conviction based on minor discrepancies between their actions and what is stated in an indictment would undermine public confidence in law enforcement's ability to protect citizens from crime.