A sniper's rampage in the nation's capital has investigators working overtime. The driving force in their case is witness testimony. While eye witness testimony is not concrete, it does act like small pieces to a bigger puzzle.
Witness testimony, however, is better when those involved pay close attention to the smallest details.
"Often times you see a description will vary by each individual," says Peter Galbraith, a senior FBI agent in Tyler. "The important thing is the individual remembers what they saw, and doesn't repeat what they saw to somebody else."