“ A 'past due obligation' is an obligation to pay money which has legally matured prior to the making, drawing, uttering, or delivering of the instrument.
"The accused must have knowledge, at the time he makes, draws, utters, or delivers the instrument, that the maker or drawer, whether the accused or another, has not or will not have sufficient funds in, or credit with, the bank or other depository for the payment of the instrument in full upon its presentment. ”

“ If a purported act, transaction, occurrence, or event is of a kind which in the regular course of business would have been made the subject of an entry in certain business entries of a particular business, proof that these business entries contain no entry concerning such act, transaction, occurrence, or event may be received as evidence that the act, transaction, occurence, or event did not take place. ”

“ For example, it includes satisfying or purporting to satisfy an obligation arising from an illegal transaction, such as an illegal gambling game, and paying or purporting to pay an obligation which is not yet past due. ”