Among those forced into false confessions, from left; Kunio Yamashita, Eiko Hamano and Sachio Kawabata.Credit...Ko Sasaki for The New York Times SHIBUSHI, Japan — The suspects in a vote-buying case in this small town in western Japan were subjected to repeated interrogations and, in several instances, months of pretrial detention. The police ordered one woman to shout her confession out a window a