Al Jazeera, August 13, 2011 by Evan Hill
http://english.aljazeera.net/news/americas/2011/08/201181221139693608.html
Jesse Choper, a professor at the Berkeley School of Law and a constitutional law expert, said BART could argue it had acted to preserve public safety rather than halt a protest but that blocking mobile services to entire areas may have obstructed more free speech than was necessary…. “The question is, what less should they have done,” he said. “Would you want them to monitor every call?”