Flat Earth 101

One believes things because one has been conditioned to believe them. ~Aldous Huxley 

Deluxe Research Flat Earth Stamper
Spread the word!

Deluxe Self-Inking Stamper,
Quick Drying.
Standard Stamper Ink for Refilling

$14    /   # FLT002

It's not Illegal to Stamp U.S. Currency

Defacement of currency is a violation of Title 18, Section 333 of the United States Code. Under this provision, currency defacement is generally defined as follows: Whoever mutilates, cuts, disfigures, perforates, unites or cements together, or does any other thing to any bank bill, draft, note, or other evidence of debt issued by any national banking association, Federal Reserve Bank, or Federal Reserve System, with intent to render such item(s) unfit to be reissued, shall be fined under this title or imprisoned not more than six months, or both. 

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It's not illegal to stamp currency. It's only illegal to deface money "with intent to render such item(s) unfit to be reissued"  Long story short if you write on it in a way that would make it unusable it's a crime.