But the question is whether the explanation given by the appellant in this case can be said to be absolutely false ? Another question that arises is what are the standards to be em ployed in order to judge the truth or falsity of the version given by the defence ? Should the accused prove his case with the same amount of rigour and certainty, as the prose cution is required, to prove a criminal charge, or it is sufficient if the accused puts forward a probable or reason able explanation which is sufficient to throw doubt on the prosecution case ? In our opinion three cardinal prin ciples of criminal jurisprudence are well settled, namely: (1) that the onus lies affirmatively on the prosecution to prove its case beyond reasonable doubt and it cannot derive any benefit from weak ness or falsity of the defence version while prov ing its case; (1) , 324. 445 (2) that in a criminal trial the accused must be presumed to be innocent unless he is.