UPDATE! The MLA has totally revamped their citation style (as of Spring 2016); until I get it figured out, my courses will roll with the 2009 edition.
I have at least one documentable plagiarism case in every class. On occasion, there is malicious intent to deceve; more often, however, the plagarism occurs accidentally -- through laziness, carelessness, misunderstanding, or panic. No matter the intent, however, all forms of plagarism are equally in violation of the Academic Honesty Policy at this (and any) institution.