criminal trial – Extra-judicial confession is a weak piece of evidence – Where an extra-judicial confession is surrounded by suspicious circumstances, its credibility becomes doubtful and it loses its importance – It is well-settled that it is a rule of caution where the court would generally look for an independent reliable corroboration before placing any reliance upon such extra-judicial confession – There is no doubt that conviction can be based on extra-judicial confession, but in the very nature of things, it is a weak piece of evidence.