Which in itself isn't really valid. Under immense stress, memory fails. I'd wager facing a long prison sentence for a crime that will make you a big target in an already hostile environment would be pretty stressful.
But the point is, after many months (eg 7) plus stress... many people would. Not everyone, but enough people that I don't think you can blanket say "you surely know it, hand it over".
I keep going over where I went wrong in the exams I did a month ago and I've already had the results with all at 90%+ (yeah r/iamverysmart, I know)
There was one rather important password that I hadn't used in a few months before I needed it. I tried for a week to remember before eventually resetting it.
Of course, if I were arrested tomorrow, I'd be able to remember my master password. I'd probably still remember it a month from now too, but a few months later not so much.
So the question is: if he was lying at first, but now no longer is, what does that mean for him, legally?
And that was without going to prison
Yep, LUKS AES-256. I seem to recall someone demonstrating how to crack LUKS for fun, but I can't remember where I found that article, nor enough keywords to find it again. I might just be failing at Google, mind.