They are legal tender, but I believe ther banks are not allowed to recirculate them if they are deposited. They are supposed to forward them to the Federal Reserve as they are retired.
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Originally posted by: MoneyLA
Indeed they are always legal tender. One of the stated policies of the US Government is that all money printed or coined never loses its face value. In fact the government goes to great lengths to tell the public is when there is a design change in the currency. There are always announcements that the "old money" is still good.
In fact, my 25-cent notes from the civil war era are still worth 25-cents at the bagel shop... but even in its poor condition I think it will fetch $10 on ebay.
US currency is never "demonetized." (uinlike casino chips -- LOL)