When I was working at Taco Bell 3 years ago, I caught two examples: A. A $100 printed on lienen stock paper with a high dpi laser jet printer. The Counterfeiter even rubberstamped a "watermark" in the right spot I presume with glue. And fit a solid "security" thread into the paper. Quite impressive. B. Another $100 bill series 1976 I believe printed on real money paper, again with a high dpi printer. The only way I knew it was fake was by magnification and seeing pixels at around 10-15x they were prominent. Still impressive but the colors were off and almost washed out in appearance which arose my initial suspicion.