20. Presumption where public servant accepts gratification other than legal remuneration.- (1) Where, in any trial of an offence punishable under section 7 or section 11 or clause (a) or clause (b) of sub-section (1) of section 13 it is proved that an accused person has accepted or obtained or has agreed to accept or attempted to obtain for himself, or for any other person, any gratification (other than legal remuneration) or any valuable thing from any person, it shall be presumed, unless the contrary is proved, that he accepted or obtained or agreed to accept or attempted to obtain that gratification or that valuable thing, as the case may be, as a motive or reward such as is mentioned in section 7 or, as the case may be, without consideration or for a consideration which he knows to be Inadequate.

(2) Where in any trial of an offence punishable under section 12 or under clause (b) of section 14, it is proved that any gratification (other than legal remuneration) or any valuable thing has been given or offered to be given or attempted to be given by an accused person, it shall be presumed, unless the contrary is proved, that he gave or offered to give or attempted to give that gratification or that valuable thing, as the case may be, as a motive or reward such as is mentioned in section 7, or, as the case may be, without consideration or for a consideration which he knows to be inadequate.

(3) Notwithstanding anything contained in sub-section (1) and (2), the court may decline to draw the presumption referred to in either of the said sub-sections, if the gratification or thing aforesaid is, in its opinion, so trivial that no inference of corruption may fairly be drawn.