California, United States of America
The following excerpt is from People v. Mendoza, F075908 (Cal. App. 2019):
The erroneous admission into evidence of an involuntary confession is federal constitutional error that requires a reversal of the judgment unless the prosecution can establish the error was harmless beyond a reasonable doubt. (People v. Cahill (1993) 5 Cal.4th 478, 509-510; Chapman v. California (1967) 386 U.S. 18, 23.)
The above passage should not be considered legal advice. Reliable answers to complex legal questions require comprehensive research memos. To learn more visit www.alexi.com.