House Homeland Security Committee Chairman Rep. Michael McCaul, R-Texas, left, holds a document about the Boston Marathon Bombing by Harvard Professor Herman “Dutch” Leonard, right, on Capitol Hill in Washington, Wednesday, April 9, 2014, prior to the start of the committee's hearing on the bombings leading up to the year anniversary of the attack. (AP Photo/Jacquelyn Martin)
Watertown, Mass. Police Sgt. Jeffrey Pugliese, right, listens to testimony on Capitol Hill in Washington, Wednesday, April 9, 2014, during a Homeland Security Committee hearing about the Boston Marathon Bombings leading up to the year anniversary of the attack. (AP Photo/Jacquelyn Martin)