On January 15, 2000, Hazmi and Mihdhar flew into Los Angeles, but it was only in August 2001 as a result of questions raised by a CIA officer on assignment at the FBI that the two were added to the watch list and their names communicated to the FBI.

CNN: Agencies often miss warning signs of attacks

But, As a young police officer I found that the violent suspects on the street are not the only people you have to watch ...

CNN: SHARE THIS

On February 26, the 17-year-old Martin was shot dead by community watch officer Zimmerman in Sanford, Florida.

CNN: STORY HIGHLIGHTS