> potential downside through false positives I just spent the last hour of my life digging through the material. It seems like they've calibrated the system to

> potential downside through false positives I just spent the last hour of my life digging through the material. It seems like they've calibrated the system to have an expected false classification rate of one account in one trillion, per year. Based on the threshold secret sharing math, they won't know anything until a user has a significant collection of CSAM and the secret key is recovered. > I’m also struggling to imagine scenarios where a child predator is clever enough to acquire illegal photos I don't want to be the bearer of bad news, but CSAM has been shared openly on the clearnet on places like 4chan for years. The internet is a pretty wide open search space. Many of the people who download CSAM don't do so from some sketchy underground website. This is why Tumblr, for instance, burned their platform to the ground: lots of people sharing CSAM with no way to detect and stop it (without costing Verizon a ton of money to work on the problem).