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Evidence that fingerprint analysis is "total bunk?" That one is news to me.

Well, not total bunk, but less reliable than generally believed:

https://www.newscientist.com/article/mg21228442-600-miscarri...

Then again a lot of forensic techniques seem to fall into the same category:

https://www.bbc.com/future/article/20150512-can-we-trust-for...

A lot of the problems come from human bias and over-stating the accuracy of tests at trial.

Well I’m fairly certain this is how they figured out who the Unabomber was. His brother recognized his style of writing and called the feds.

It's statistical analysis of word frequency, distribution, phrasing, and other features to create a fingerprint of someones writing style. I'm not sure what you mean by evidence, it's used to narrow a set of possibilities of authorship like a search filter.