“54. …. Once the presumption under Section 139 was given effect to, the courts ought to have proceeded on the premise that the cheque was, indeed, issued in discharge of a debt/liability. The entire focus would then necessarily have to shift on the case set up by the accused, since the activation of the presumption has the effect of shifting the evidential burden on the accused. The nature of inquiry would then be to see whether the accused has discharged his onus of rebutting the presumption. If he fails to do so, the court can straightaway proceed to convict him, subject to satisfaction of the other ingredients of Section 138. If the court finds that the evidential burden placed on the accused has been discharged, the complainant would be expected to prove the said fact independently, without taking aid of the presumption. The court would then take an overall view based on the evidence on record and decide accordingly.