These sites has helped me find information on my investigative topic.
Illinois Department of Agriculture
http://www.agr.state.il.us
Attorney General's Office
http://www.illinoisattorneygeneral.gov/index.html
Other helpful sites I listed below has helped me come up with ideas and ways to make my topic better and make more sense. There is nothing wrong with using other reporter's ideas, as long as each reporter comes up with a new and fresh take on that specific topic.
Investigative Reporters and Editors
http://www.ire.org
Poynter Online
http://www.poynter.org
PR Newswire
https://profnet.prnewswire.com
Brookings
htttp://www.brookings.edu