From Hein’s blog:
Almost 20 years has passed since the American Association of Law Libraries (AALL) published The Final Report of the Task Force on Citation Formats. Since then, there have been many changes in the way information is gathered, shared, and accessed, making the need for universal citation (also known as public domain citation) systems even greater.
As states publish primary documents on their own web sites and researchers utilize a wide variety of options to access legal materials, it is necessary to have a universal system of citation that helps users locate information across all formats, platforms, and publishers.
The Universal Citation Guide, 3rd ed. recognizes the current practices of legal researchers who often consult an electronic research tool without ever seeing a print volume of a reporter or code sitting on a library shelf.