Here is a New York Times article you may wish to pass along to your freshmen, as they start down the road of research in your library:
Dear Plagiarists: You get what you pay for
http://www.nytimes.com/2004/08/22/books/review/22HANSENL.html?ex=1250827200&en=c12688ef34fc026e&ei=5090&partner=rssuserland