. >> reporter: jennifer pachikoa remembers it well. a marker like this even identified the bill as legitimate but it was actually a 5-dollar bill to look like 100. later that day jennifer put this sign up. i just want to ask you a couple of questions. we caught up with her on a side street. how many times have you done that? why did you think you could getaway with that? i didn't. >> reporter: that's a federal crime. they found case after case of bills being passed. to even a teenager trying to buy a piece of pizza with a fake 20. >> they are usually the lowest level of people they are not the ones that are manufacturing it. >> reporter: at jfk airport fake hundreds were concealed in ebbing wi equidor. >> reporter: now cases come into the boston office every day. last year they pulled about a million dollars of phoney currency out of circulation in massachusetts. special agented in charge lisa quinn says a lot of bad money gets passed around during the holidays. >> if your the person left holding the bill when it's determined to be coun