Glare

Glare  (グレア, Gurea) is the eighth episode of the Death Note (anime).

Synopsis
After Misora's disappearance, L decides to have surveillance cameras and bugs installed in the homes of the people that the FBI had been tracking at the time of Raye Penber's death, including Light.

Light soon notices that he is  under surveillance by a three-step method he set to see if anyone had entered his room while he was away: a piece of paper in his bedroom door  that was visible from the outside; a piece of mechanical pencil lead in the hinges of the door; and a doorknob that only went up to, and closed at 90 degrees, so whenever he left he would lower the handle by a few degrees. By telling Ryuk that he will have to stop giving him apples if he did not find all of the cameras, Light effectively had all of the cameras found in a relatively short time with Ryuk's help.

To continue his tasks as Kira, he hides a mini LCD television in a bag of potato chips. The footage was then evidence that Light was not Kira under the thought that he had no idea about the deceased criminals' existence.

Trivia

 * The famous "I'll take a potato chip, and eat it!" scene was originally from this episode.