You can not know the false negative rate without investigating 100% of all photos. You are asking for the impossible.
replySure you can, random sampling should work. Don't just go making things up.
replyOf course actually carrying out that experiment would be absurd since I don't think anyone expects an appreciable percentage of clearnet material to be CSAM. The working assumption is that the goal is to find a needle in a haystack so GP's objection about needing to know the false negative rate is misguided.
I expect the equivelent of the fbi is investigating this using other sourcs and so has plenty of data without needing to randomly sample any non-suspect conversation. CASM has been a problem since before computers.
replyif you want perfection. But the eu should be doing investigation that they can use statistics to create a good estimate.
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