4 Pursuit - Tsuiseki(追跡)

Light tells Ryuk that he is trying to create an ideal world where no criminals are left unpunished and that as the god of such a world he cannot sacrifice half of his life for the shinigami eyes. Light begins experimenting to find out how much control he has over how a criminal dies. He tries to have prisoners escape or draw L's face before they die. When they fail to do so, he learns that the Death Note is not all-powerful. Using this knowledge, Light devises a plan to find out who has been following him. Light has a drug dealer touch the Death Note and makes him hijack a bus before he dies. During the hijacking, Light gets his tracker to reveal that he is Raye Penber, a Federal Agent from the United States employed by L and his associate Watari.