Dexter Morgan is a serial killer and a key member of the forensics departments in the Miami Police Department. His two lines of work often intersect, dangerously, with one another.
Dexter is often forced to work against his co-workers. Especially when they are so good at their jobs that they get in the way of his brand of justice.
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.