Failed to detect Class A counterfeit. The counterfeit notes was made from a partial real notes (90%) of a 1000 THB bills and another portion (10%) from a fake paper with a silver foil tab from a 100 THB bills. There was a number 100 on the silver foil tab instead of a number 1000. The MS 500 was unable to detect this notes and accepts it as a “ Real” 1000 THB Bills. The same notes then was tested with 3 CDM machines (Wincor, Dibold, and NCR). All CDM machines in production were able to detect this counterfeit notes.