Actually from what I found it appears defacing only refers to if the item is unfit to be used after you did something to it. A small stamp or a phone number, etc.. must not be defacing because a bank would yank it out of circulation.
From the US Treasury website..
"Defacement of 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 not more than $100 or imprisoned not more than six months, or both."
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