The police reveal poison was only found on the victim's left thumb and forefinger causing them to be dumbfounded on how poison was applied. Conan asks the police on what possessions the suspects have and eventually realizes how Saizu was killed. He tranquilizes Kogoro and reveals Atsushi Tanaka, Saizu's barber, as the culprit. He explains how poison is applied on the rim of the victim's glasses during his haircut.