go down this list, check out a few links: http://en.m.wikipedia.org/wiki/List_of_unsuccessful_terrorist_plots_in_the_United_States_post-9/11 I saw one that said Dallas and I knew nothing about it, so I clicked: Immigration officials were trying to determine how Smadi was able to work at a gas station, since he only had a 2007 tourist visa.[1][3] Smadi was provided with a fake bomb by FBI agents posing as members of al-Qaeda. I'm not even trying, hereSmadi was in the United States illegally, and unaware he was under continuous surveillance, and that the other members of his "sleeper cell" were all Federal agents.[2] The agents in his "sleeper cell" had supplied him with inert chemical, so his bomb had not posed a real threat.[4]
I remember hearing a story on NPR a few months ago that basically said that the FBI has disrupted zero plots when you take away all the plots they've concocted then coaxed a muslim into carrying out. Apparently the courts have basically decided that no matter how much resources the FBI has to put into it, and how much cajoling the suspect needs in order to agree, they're on the side of the feds.