don't mean to be a downer... just becareful what you do to the bill... I've been on wheresgeorge for years and have seen good bills and bad bills..
here's what the U.S. says...

http://www.bep.treas.gov/document.cfm/18/104

But i've learned as long as you don't write too much... keep it in the border... do not write on the denomination, series, or serial number. Other than that you can pretty much do whatever... Red works very well as does purple.... round stamps work really welll around the bank mark (the letter on the front).

I just put 'make the most of the hemp seed' 'and sow it everywhere' - George Washington... on the front border and websites on the back. www.pot-tv.com is and easy one that pretty much describes what it's there for.

Um... for all of you who wanna use some Lincoln's here's a quote from him...

"A prohibition law strikes a blow at the very principles upon which our government was founded."

-- Abraham Lincoln, December, 1840

great idea and great way to spread the word... just make sure you don't mark them up too much cause the idea is to keep them in circulation and if htey are marked too much they will be destroyed by the bank when they get there.
Gumby Reviewed by Gumby on . A suggestion for Americans spreading the word I was visiting the Where's George? website, and I got this idea. Next time you get a $1 bill, write on it "This man grew marijuana!" and point to George Washington's face. Also, you might want to consider writing a URL like www.jackherer.com or www.norml.org. Rating: 5