And for context: both of those numbers are based on studying proven false convictions of people given the death penalty, which of course is a) supposed to have a high bar of evidence to convict in the first place and b) does have an incredibly high bar of both evidence and legal argument to be proven innocent after conviction.
Since the majority of people convicted of crimes in the USA didn't even go to trial, it is realistically impossible that this number applies to all people in prison - the percentage of false overall convictions must be higher than the percentage of people who were sentenced to death and then proved themselves innocent, given the different pressures and levels of scrutiny on different crimes.
https://innocenceproject.org/how-many-innocent-people-are-in...