existence of a legally enforceable debt or liability can be contested. However, there can be no doubt that there is an initial presumption which favours the complainant. S.139 of the Act is an example of a reverse onus clause that has been included in furtherance of the legislative objective of improving the credibility of negotiable instruments. While S.138 of the Act specifies a strong criminal remedy in relation to the dishonour of cheques, the rebuttable presumption under S.139 is a device to prevent undue delay in the course of litigation. However, it must be remembered that the offence made punishable by S.138 can be better described as a regulatory offence since the bouncing of a cheque is largely in the nature of a civil wrong whose impact is usually confined to the private parties involved in commercial transactions. In such a scenario, the test of proportionality should guide the construction and interpretation of reverse onus clauses and the accused / defendant cannot be expected to discharge an unduly high standard or proof. In the absence of compelling justifications, reverse onus clauses usually impose an evidentiary burden and not a persuasive burden. Keeping this in view, it is a settled position that when an accused has to rebut the presumption under S.139, the standard of proof for doing so is that of 'preponderance of probabilities'. Therefore, if the accused is able to raise a probable defence which creates doubts about the existence of a legally enforceable debt or liability, the prosecution can fail. As clarified in the citations, the accused can rely on the materials submitted by the complainant in order to raise such a defence and it is conceivable that in some cases the accused may not need to adduce evidence of his / her own.
