"11. The law on the issue is well settled that demand of illegal gratification is since qua non for constituting an offence under the 1988 Act. Mere recovery of tainted money is not sufficient to convict the accused, when the substantive evidence in the case is not reliable, unless there is evidence to prove payment of bribe or to show that the money was taken voluntarily as bribe. Mere receipt of amount by the accused is not sufficient to fasten the guilt, in the absence of any evidence with regard to demand and acceptance of the amount as illegal gratification, but the burden rests on the accused to displace the statutory presumption raised under Section 20 of the 1988 Act, by bringing on record evidence, either direct or circumstantial, to establish with reasonable probability, that the money was accepted by him, other than as a motive or reward as referred to in Section 7 of the 1988 Act. While invoking the provisions of Section 20 of the Act, the court is required to consider the explanation offered by the accused, if any, only on the touchstone of preponderance of probability and not on the touchstone of proof beyond all reasonable doubt. However, before the accused is called upon to explain as to how the amount in question was found in his possession, the foundational facts must be established by the prosecution. The complaint is an interested and partisan witness concerned with the success of the trap and his evidence must be tested in the same way as that of any other interested witness and in a proper case the court may look for independent corroboration before convicting the accused person"
