This is a clip from the Dexter episode "Road Kill." In it, the Miami PD tries to determine the best way to catch a killer.
Added:
In this clip from Dexter, our favorite killer visits Trinity's home. He witnesses a few "cracks in the perfect family."
Added:

Dexter Season 1 Quotes

The only real question I have is why in a building full of cops, all supposedly with a keen insight to the human soul, is Doakes the only one who gets the creep from me.

Dexter Morgan

I think this is a friendly message like, "Hey! wanna play?" and yes I wanna play. I really really do.

Dexter Morgan