What does the Supreme Court mean when it says confessions used as evidence must be voluntary ? Explain the court's decision and reasoning in Watts v

What does the Supreme Court mean when it says confessions used as evidence must be voluntary ? Explain the court's decision and reasoning in Watts v. Indiana (1949) about voluntary vs. involuntary confessions and what amendment and clause did they use in their reasoning? What were some of the key points in Justice Jackson's dissent in this case? What can and what can't the police do during interrogations after this ruling by the court?

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