Which statement is true about the Brady Rule's origin?

The statement about the Brady Rule's origin being related to the duty to disclose exculpatory and impeachment evidence is accurate. The Brady Rule stems from the landmark Supreme Court case Brady v. Maryland (1963), which established that the prosecution must disclose evidence that is favorable to the defendant. This includes exculpatory evidence—evidence that might exonerate the defendant—as well as impeachment evidence, which can be used to challenge the credibility of prosecution witnesses. The core principle of the Brady Rule is to ensure fair trials by preventing the suppression of evidence that could significantly impact the outcome of the case.

The other statements do not accurately reflect the origins of the Brady Rule. The idea of a right to a speedy trial is a separate constitutional right outlined in the Sixth Amendment, whereas the protection of confidential informants pertains to a different legal consideration entirely. Additionally, the Brady Rule was not created to lessen the number of trials, but rather to uphold the integrity of the judicial process by ensuring that the defendant receives all relevant information that could influence the trial's outcome.