Section 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 Section 138 of the Act specifies a strong criminal remedy in relation to the dishonour of cheques, the rebuttable presumption under Section 139 is a device to prevent undue delay in the course of litigation. However, it must be remembered that the offence made punishable by Section 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.