There is nothing in either of the provided sources which indicates that Yoshie Shiratori was forced to confess or that he was falsely imprisoned. The article in Japanese states they Aomori Police conducted a frantic investigation, but there's nothing that indicates false imprisonment in either cited source.
After Shiratori was forced to confess to robbery and murder, Shiratori was falsely imprisoned at Aomori prison in 1936., Howeverhowever, after studying the guards' routine for months, he escaped by picking his cell lock with the metal wire that was wrapped around the washroom's bucket provided for bathing and escaped through a cracked skylight.<ref name="mc20">{{Cite web |last=Carlos |first=Marius Jr. |date=2020-02-03 |title=Yoshie Shiratori: The Incredible Story of a Man No Prison Could Hold |url=https://www.breakingasia.com/gov/yoshie-shiratori-the-incredible-story-of-a-man-no-prison-could-hold/ |access-date=2020-12-08 |work=Breaking Asia |language=en}}</ref><ref name="ana20">{{Cite web |date=2016-06-30 |title=昭和行刑史に残る脱獄王・白鳥由栄の人生 |url=https://anabre.net/archives/post-12392.html |access-date=2020-12-08 |work=アナブレ |language=ja}}</ref> Before escaping, he placed floorboards onto his [[futon]] to fool the passing guards into thinking he was still asleep.<ref>{{Cite book |last=斎藤充功 |url=https://books.google.com/books?id=lsSSzwEACAAJ&newbks=0&hl=en |title=日本の脱獄王: 白鳥由栄の生涯 |date=February 2023 |publisher=論創社 |isbn=978-4-8460-2180-1 |language=ja}}</ref>
