I don't see the problem. Extended detention and repeated interrogation is normal around the world. Visit Rikers island and look at how long people are held there prior to trial (years). The focus on confessions isn't a Japanese thing. Look at how many americans/canadians/brits/auzzis agree plea deals, a form of confession. Repeated questioning isn't torture. In the USA it is true that police have to stop asking quest…
That would be my understanding, yes.