Many are wondering why the FBI overlooked the potential danger posed by now-deceased bombing suspect Tamerlan Tsarnaev in 2011 after they interviewed him.
The FBI insists to CBS that they took all the required steps that were permissable under the law. However, around the same time the bureau interviewed Tsarnaev, changes in the FBI training manual took place as well. The FBI's own departmental counter-terrorism analytic lexicon was purged of key words that could reference Islamic terrorism. Words like Muslim, Islam, Muslim Brotherhood, Hamas, and sharia were not mentioned once in the FBI's counter-terrorism lexicon afterwards.
The FBI initially denied the existence of the document in 2012 until PJ Media's Patrick Poole posted the unclassified doc in May of that year. Congressman Louie Gohmert (R-TX) took the issue to the House floor and excoriated the administration for allowing the changing of the training manual to happen.
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Here is a related story. Boston bombers: FBI hunting 12-strong terrorist “sleeper cell” linked to brothers Tamerlan and Dzhokhar Tsarnaev