The U.S. Justice Department frowns on a shield law

Probably not a surprise that the U.S. Justice Department has come out against a law protecting journalists.

http://www.washingtonpost.com/wp-dyn/content/article/2005/07/19/AR2005071901474.html

I'm curious what the reader of this post thinks of the arguments put forth by the department. Do they have any merit?