Question about police interrogations?

I am writing a paper on false confessions and I know that it is illegal for police officers to give promises of leniency during an interrogation. For instance, the officer tells the suspect that if he confesses, the officer guarantees that the state will not seek the death penalty and the suspect will receive a... show more I am writing a paper on false confessions and I know that it is illegal for police officers to give promises of leniency during an interrogation. For instance, the officer tells the suspect that if he confesses, the officer guarantees that the state will not seek the death penalty and the suspect will receive a life sentence, as opposed to death. I need to know the court case where this was decided so I can cite it in my paper.
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