Black Swan is the thirteenth episode of the fourth season. It was released on 4 April 2008.

A meth lab bust yields a surprise arrest that stymies the team when they can't figure out why he was in the area, and Megan disagrees strongly and repeatedly with what Don chooses to do to get his answers.


This refers to black swan theory, not the movie. The impression is of an inconceivable statistical aberration, one which shifts the paradigm.