Stampers can be used on any paper item that absorbs ink -- US cash is something that is readily seen and not thrown away. 😉 Photos on this page are those that have been shared with Saving Our Sons over the years. To add yours to this album, upload into the Saving Our Sons Community, post at Telegram (t.me/SavingOurSons), MeWe (MeWe.com/join/SavingOurSons), or email SavingSons@gmail.com
YES, it is legal to stamp cash (https://www.stampstampede.org/faq/yes-its-legal/). Stampers can also be used to stamp sticky notes to leave places (inexpensive way to 'card').
Further information and intactivist stampers: http://www.savingsons.org/2016/02/intact-info-stampers.html