Recap: Death Note Ep 18 Ally

Another day for work, Aizawa arrives to a new building. He has trouble with a metal detector. Even if he has removed all the metallic items, he's still not getting passed through. Watari watches this moment and comments on getting used to this one. Aizawa takes off his pants and finally enters the building.

It turns out that he, Matsuda, and Soichiro, are in surveillance of Light, L, and Misa in one room. She's annoyed by L's presence that she tries to make suggestions of keeping him out of sight like closing the curtains and turn off the lights. L foiled that suggestion by the use of infrared lights.

This episode provides examples of: