re: Aaron Hernandez had "severe" case of CTE

quote:

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I'd really like to know how many college and pro football player's brains have been autopsied so far that have shown NO evidence of CTE?

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Well that's the thing. The brains that have been tested are mainly people who were noticing signs that suggest they had CTE.

It's a pretty big problem of self-selection bias. So until there are more people donating their brains for testing (or a way to test without the subject being deceased), it's difficult to really tell how wide spread that problem is in the larger population; even just in the NFL.