In states such as Iowa, Florida and Minnesota, USA, proposed bans on the use of undercover videos from settings like factory farms would eliminate a source of information that has been effective in identifying critical problems such as animal abuse and dangerous food safety violations.

http://www.foxnews.com/politics/2011/04/15/states-consider-outlawing-undercover-animal-abuse-videos/#ixzz1Ji17JjYr
http://www.nytimes.com/2011/04/14/us/14video.html?_r=1
http://www.startribune.com/local/119690504.html