Not that I would do anything like this.... but just wondering the extent of the law. I see chop marks on bills as well as coins. I consider it graffiti.
I picked up some of the NO MORE LIES / FREE PRESS nickels. Another great issue from Shirepost. Not sure if they are limited but they will presumably be out of production at some point, so the time to add them to your counterstamp collection is now while they are cheap and plentiful. They are great to have in a collection of counterstamps, and if a few slip into circulation it is fun to imagine where they will go and what reactions they will generate.
We've now struck over 25,000 of the counterstamped "novelty" nickels, wearing out two sets of dies. Many rotational and die-state variations exist. They're now all over the place. Some runs were done using bricks of all a single date. Others on mixed random date nickels. Early runs were hand-oriented to set the counterstamp in a certain orientation relative to the design. Later runs using automatic feed are completely random in orientation.
My favorite story with the nickels is... staying in rural Nevada for a couple weeks prospecting. I would go down to the convenience store every morning for my cup of coffee. $1.05, dollar and a nickel. Did that for about a week. Then the lady finally looked at the nickel and said: "Hey wait a minute! This says something on it?" I shrugged my shoulders. "No More Lies, hmmmm". She looked at me funny then opened the cash drawer and went to put the money in... looked in and said dismissively, "Oh, we've got a whole bunch of 'em. It must just be the new one!" I smiled as casually as I possibly could. I just love that she thought that a real nickel could possibly say "No More Lies" on it
I recently received a 2009 cent with the shape of the State of Ohio on it's obverse. Wish I still had that one.... It's got to be in one of my tubes of Cu/Zn cents somewhere.