I had a friend who graduated from University of Iowa law school. If I remember correctly, he told me that everyone had their GPA bumped up by a third because graduates weren't measuring up to other law schools if potential employers filtered by GPA.

Found this at http://www.law.uiowa.edu/documents/2010-11_handbook_web.pdf which would seem to back it up since he was in law school at this time: "In November 2005, the faculty decided to adjust the grading scale and grading curve applicable to the students who entered the College in May 2004 and thereafter. This change included a retroactive adjustment of the grades of students entering in May 2004 or thereafter."

And wikipedia has an article showing a pretty large range with where various law schools set their 50% mark. See http://en.wikipedia.org/wiki/List_of_law_school_GPA_curves