controlled by the police either by themselves or through some other agency employed by them for the purpose of securing such a confession. The question whether a confession is voluntary or not is always a question of fact. All the factors and all the circumstances of the case, including the important factors of the time given for reflection, scope of the accused getting a feeling of threat, inducement or promise, must be considered before deciding whether the court is satisfied that in its opinion the impression caused by the inducement, threat or promise, if any, has been fully removed. A free and voluntary confession is deserving of the highest credit, because it is presumed to flow from the highest sense of guilt. (See R. v. Warickshall [(1783) 1 Leach 263 : 168 ER 234] .) It is not to be conceived that a man would be induced to make a free and voluntary confession of guilt, so contrary to the feelings and principles of human nature, if the facts confessed were not true. Deliberate and voluntary confessions of guilt, if clearly proved, are among the most effectual proofs in law. An involuntary confession is one which is not the result of the free will of the maker of it. So where the statement is made as a result of harassment and continuous interrogation for several hours after the person is treated as an offender and accused, such statement must be regarded as involuntary. The inducement may take the form of a promise or of a threat, and often the inducement involves both promise and threat, a promise of forgiveness if disclosure is made and threat of prosecution if it is not. (See Woodroffe's Evidence , 9th Edn., p. 284.) A promise is always attached to the confession alternative while a threat is always attached to the silence alternative; thus, in one case the prisoner is measuring the net advantage of the promise, minus the general undesirability of a false confession, as against the present unsatisfactory situation; while in the other case he is measuring the net advantages of the present satisfactory situation, minus the general undesirability of the confession against the threatened harm. It must be borne in mind that every inducement, threat or promise does not vitiate a confession. Since the object of the rule is to exclude only those confessions which are testimonially untrustworthy, the inducement, threat or promise must be such as is calculated to lead to an untrue confession. On the aforesaid analysis the court is to determine the absence or presence of an inducement, promise etc. or its sufficiency and how or in what measure it worked on the mind of the accused. If the inducement, promise or threat is sufficient in the opinion of the court, to give the accused person grounds which would appear to him reasonable for supposing that by making it he would gain any advantage or avoid any evil, it is enough to exclude the confession. The words “appear to him” in the last part of the section refer to the mentality of the accused.”