Nitpick: > the ALCU set it to use an 80% confidence level threshold, which should result in a 5% false positive rate. I'm not sure where the "should" in this

Nitpick: > the ALCU set it to use an 80% confidence level threshold, which should result in a 5% false positive rate. I'm not sure where the "should" in this sentence is coming from. As far as I know, Amazon's documentation doesn't claim any particular relationship between confidence and false positive rate. The 5% number in the article was simply talking about the actual false positive rate that the ACLU observed. Not to say the conclusions of the article are wrong, though. It certainly seems unreasonable for someone to assume that "80% confidence" would give an FPR of less than 5%.