Canada recently introduced its new $100 bill. If you have ever been to Australia you know what their bills are made out of, that plasticy stuff that doesn't rip and is water proof.
The reason Canada did this was because its bills were the most counterfeited in the Western world. Australia had the lowest counterfeiting rate, so now what Canada does is they buy the material from Australia (the only place you can buy this special polymer) and then they ship it to the mint in Ottawa.
Soon all bills in Canada will be made out of the stuff, but they just rolled out the 100's.
Basically, the political fear was that a high counterfeit rate would completely undermine the Canadian economy. Hitler during WWII tried something similar by counterfeiting UK pounds, very high quality one's, but they never made it into circulation for some reason.