State of Rajasthan Vs. Mohan Lal, Decided by SC on 16.04.2009

Bare reading of Section 378 of the present Code quoted above, makes it clear that no restrictions have been imposed by the legislature on the powers of the appellate court in dealing with appeals against acquittal. When such an appeal is filed, the High Court has full power to reappreciate, review and reconsider the evidence at large, the material on which the order of acquittal is founded and to reach its own conclusions on such evidence. Both questions of fact and of law are open to determination by the High Court in an appeal against an order of acquittal.
It cannot, however, be forgotten that in case of acquittal, there is a double presumption in favour of the accused. Firstly, the presumption of innocence is available to him under the fundamental principle of criminal jurisprudence that every person should be presumed to be innocent unless he is proved to be guilty by a competent court of law. Secondly, the accused having secured an acquittal, the presumption of his innocence is certainly not weakened but reinforced, reaffirmed and strengthened by the trial court.
Referring to the interdependence of evidence and the confirmation of one piece of evidence by another, a learned author says [see "The Mathematics of Proof II": Glanville Williams, Criminal Law Review, 1979, by Sweet and Maxwell, p.340 (342)]: The simple multiplication rule does not apply if the separate pieces of evidence are dependent. Two events are dependent when they tend to occur together, and the evidence of such events may also be said to be dependent. In a criminal case, different pieces of evidence directed to establishing that the defendant did the prohibited act with the specified state of mind are generally dependent. A junior may feel doubt whether to credit an alleged confession, and doubt whether to infer guilt from the fact that the defendant fled from justice. But since it is generally guilty rather than innocent people who make confessions, and guilty rather than innocent people who run away, the two doubts are not to be multiplied together. The one piece of evidence may confirm the other.