Numb3rs

Season 2, Episode 19

Episode Title: Dark Matter

Air Date: 2006-04-07

Overview:

Don and his team investigate a school shooting. He learns two students could have a strong motive, so Charlie uses the school's radio frequency identification system to track the shooters' movements through the school's hallways. When Charlie detects an abnormal pattern, the agents take a look at the evidence and discover a third participant no one had suspected earlier.