Confession caused by inducement, threat, coercion or promise is irrelevant where authority-induced expectation renders it unreliable. Confession evidence is excluded when the Court finds it was produced by inducement, threat, coercion or promise from a person in authority sufficient to give the accused reasonable grounds to expect temporal advantage or avoidance of detriment, unless the Court is satisfied that the impression from such influence was fully removed; but a confession otherwise relevant is not made irrelevant merely by promise of secrecy, deception to obtain it, intoxication, answering unrequired questions, or lack of warning about voluntariness.