Numb3rs (2005)

Amita Ramanujan: Charlie, where did you learn all this stuff about assassination?
Charlie Eppes: If I told you that I'd have to kill you.
Amita Ramanujan: Okay, seriously.
Charlie Eppes: Seriously.

Thirteen - S4-E4

Trivia: The episode revolves around a man killing people with the same first names as the thirteen apostles (Mary Magdalene being the 13th), and killing them in a similar fashion in which the apostles died. At one point, Colby and David find a box with a mannequin's head in it. This is a reference to the film Se7en, in which seven people are killed for committing one of the seven deadly sins. The film ends with the main characters finding an actual head in a box.

Power - S4-E12

Question: In a few episodes, the FBI agents will walk into a room and say "smell that?" and the reply is "shots fired", supposedly because they can smell the distinct odor of burnt gunpowder. Then they'll look behind a desk and find a dead body in a pool of blood. But wouldn't the smell of a dead person, or the blood, be way more overpowering? Or would it take too long for a dead body to start to smell? And how long would the smell of gunfire in an enclosed room last?

Bishop73