gratification other than legal reward, as a motive or reward for doing or forbearing to do any official act in the exercise of his official functions to favour the prime mover is the statement of the Contractor, PW-2. As already noticed, the Contractor has given different versions of the occurrence in his statement before the vigilance wing and in Court. At the trial, he has not supported the prosecution case fully. On the other hand, the explanation given by the appellant both during the cross-examination of prosecution witnesses and in his own statement, recorded under Section 313, Cr.P.c. is quite plausible. Where an accused sets up a defence or offers an explanation, it is well settled that he is not required to prove his defence beyond a reasonable doubt but only by preponderance of probabilities. On prosecution’s own showing, in this case, that onus can be said to have been duly discharged by the appellant, more particularly, when the prosecution did not lead any evidence to show as to who made the payment to Kamalasanan who had removed the bump from the road, which bump was otherwise required to be removed by PW 2 for getting refund of his earnest money and security. Maybe, the allegation that the appellant accepted the amount as bribe to process his refund application is true but the Court cannot convict an accused only on such probability or suspicion, howsoever strong it may be. ‘Between may be true and must be true, there is a