The Code of Harry is a set of guidelines created by Harry Morgan and Dr. Evelyn Vogel to help Harry's adopted son, Dexter Morgan, channel his need to kill. Originally, the code was thought to have been created simply by only Harry himself, as both a way to protect his son as he went through life and as a "tool" to rid the world of the cruel people that infested it. However, it's revealed that Dr. Vogel suggested the code, as a way to channel Dexter's impulses, which could not be stopped and use them throughout life to both satisfy his needs and in some sense do some good.