We had 3 part forms and the signature appeared on each. There were times when it was helpful to know which employee signed the item before it was actually presented for payment, but rlcarey's response reflects my level of concern as well. I don't see any likelihood of a clearly labeled copy sans a MICR line escaping into the clearing system.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.