I helped 9/11 survivors recover. The worst part came 6 months after.

''At first he didn't look suspicious, not to me anyway. A tall guy in his late 20s, sandy brown hair, glasses, wearing khakis and a blue striped button-down shirt. Just another downtown office worker, laid off and seeking a little help with the rent.More on 9/11 and its legacy

I was stationed with two other caseworkers in the center of an enormous rectangular room, nearly a football field long. A freight train of folding tables snaked down the center, throngs of people buzzing around them.

It was busy that day, and loud — hundreds of conversations, chairs scraping and banging, voices raised. Still, through the crowds and the din, my coworkers Shelley and Maria managed to peg this guy the moment he cleared the FEMA table...''

by Kelly Caldwell