Escobedo v. Illinois
Police and prosecutors interrogated Escobedo for fifteen hours.  They made Escobedo stand, handcuffed, for the entire time.  Escobedo continued to ask to speak with his lawyer, and they continued to refuse.  Escobedo later said that the police promised him he could go free, and would not be charged with murder, if he just confessed to the crime.  Finally, after "becoming more emotional," Escobedo said something about being connected with the crime.  The police took this as an indirect confession.