Cheques and Promissory notes are admissible in evidence for civil cases such as Collection Cases for sum of money, Judicial Foreclosure of Mortgage, etc. but not for ciminal prosecution of estafa or deceit.

While checks may have probative value to establish motive or intent it is not the quantum of proof to establish guilt beyond reasonable doubt. Promissory Notes on the other hand will disprove estafa since this document will clearly establish a loan transaction.

The safest way in transaction involving forebearance of money or exchange of goods for money is to have a contract or document that clearly specify the nature of transaction.

Never get swayed by sweet talking persons and you might end up scammed.