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Why Japan's Conviction Rate is 99% (Actually Explained)

4 videos recommended on HN
YouTube
3 HN users recommended this explainer3 months2020 score 3
Years with an HN recommendation, 2007–2026

Recommended as a sourced, nuanced corrective whenever the Japanese justice system's conviction rate is raised.

Yuta explains what Japan's 99% conviction rate actually means, noting that prosecutors drop cases unless confidence is very high. He argues that the number is widely misunderstood and cites his sources.

“I've seen this Japanese person explaining the situation informally but thoroughly.” (HN, 2020)

3 recommendations · 1 citations · Explainers

4 Hacker News comments

From the HN archive; up to 20 kept per video, favoring different commenters. Recommendations first.

@diegoperini Feb 2020 Recommends
on HN thread Japan’s Lost-and-Found System
I'm not Japanese, but I've seen this Japanese person explaining the situation informally but thoroughly. [this video] The premise is, yes 99% percent is a measured rate but also has no utility in a discussion if the other parts of the big picture is ignored.
Thorough explanation of 99% conviction rate context
@jdtang13 Mar 2020 Recommends
on HN thread Problems with Japan's Covid-19 reports
This 99% number does not mean what people think it means. The Japanese prosecution system is a pipeline that strongly filters out unlikely-to-be-convicted cases from the very beginning. Long before you are convicted, you might not even be arrested, or your case gets dismissed earlier in the pipeline. Here is a video, with references, from a relatively trustworthy source: [this video]
Referenced explanation of the 99% conviction figure

Citations, criticism and jokes

@jbay808 Feb 2020 Cites it
on HN thread Japan’s Lost-and-Found System
The high conviction rate seems to be because cases are dropped unless the prosecution's confidence is very high, rather than letting it go to trial. [this video]
Explains the high conviction rate

Video list and Hacker News comment labels from HackerTube (prompted by @karpathy), released under ODC-By 1.0, built on the open-index/hacker-news archive. Hacker News data is provided by Y Combinator; comments remain the work of their authors. Video titles, channel names and thumbnails belong to their creators and are shown via YouTube. HackerTube Watch is an unofficial edition. Data export of 2026-10-31.

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