On my way out as JEBO editor, I have written an essay to appear in a book of these by economics journal editors being edited by Michael Szenberg. Mine is entitled "From the Editors' Crypt: Accusations of Plagiarism True, Uncertain, and False." It can be accessed on my website at http://cob.jmu.edu/rosserjb, scroll all the way down. Aside from the various cases I discuss, a major theme is that false accusations can sometimes be more of a problem than true ones.
In the meantime, Merry Christmas to everyone, along with any other holidays of this season you are of a mind to celebrate, or have recently finished celebrating.