Which case established that involuntary confessions cannot be used in court?

The case that established that involuntary confessions cannot be used in court is Brown v. Mississippi. This landmark Supreme Court decision ruled that confessions obtained through coercion, such as physical violence or psychological pressure, violate the Due Process Clause of the Fourteenth Amendment. The Court held that confessions must be voluntary to be admissible as evidence in criminal trials, ensuring that individuals are protected from self-incrimination and unjust treatment by law enforcement.

In the context of this case, the Court recognized the fundamental principle that any confession obtained under duress is unreliable and fundamentally unfair. This ruling set a precedent for the exclusion of coerced confessions in subsequent cases, significantly shaping the legal landscape regarding interrogation practices and the protection of a defendant's rights.