Notwithstanding the clear import of the postmaster’s certification, the prosecution failed to adduce any other proof that petitioner received the post office notice but unjustifiably refused to claim the registered mail. It is possible that the drawee bank sent petitioner a notice of dishonor, but the prosecution did not present evidence that the bank did send it, or that petitioner actually received it. It was also possible that she was trying to flee from complainant by staying in different addresses. Speculations and possibilities, however, cannot take the place of proof. Conviction must rest on proof beyond reasonable doubt. Clearly, the evidence on hand demonstrates the indelible fact that petitioner did not receive notice that the checks had been dishonored. Necessarily, the presumption that she knew of the insufficiency of funds cannot arise.

Justice Panganiban, Third Division King v. People, G.R. No. 131540, December 2, 1999