It took a LONG time to get the design we now have because of the US's resistance to changing the look. 66% of all US currency is on FOERIGN SOIL, not in the the United States like you would expect. North Korea and Columbia are some of the most formidable counterfeiters. North Korean $100 bills rival our own! They can afford to buy intaglio printing presses and use techniques similar to ours.

SADLY... all the counterfeit measures fail if WE do not look at it. Often ONE SIDED notes are passed and don't so up until the register is counted at the end of the night!