The U.S. Supreme Court's decision in the 1975 Breed v. Jones case resulted in a win for the defendant. The court found the defendant was unfairly treated to two trials for the same offense. This double trial was deemed to be in violation of protections against double jeopardy, which states a defendant may not be tried for the same crime following a conviction or acquittal.
The defendant in the case went through a juvenile court trial in which he was accused of armed robbery for an incident that occurred in 1971. During juvenile proceedings, the 17-year-old defendant was determined to be unfit for trial in the juvenile system and was ordered to undergo trial as an adult. The defense attorney felt that the reassignment went against the double jeopardy clause of the Fifth Amendment of the Constitution. The prosecutor argued that it was not a case of double jeopardy because the defendant only faced a single punishment for the crime. The case went before the California Supreme Court before making its way to the U.S. Supreme Court, and the double jeopardy decision was based on the fact that, even though the defendant faced a single punishment, he still had to face two separate trials in front of two separate courts.