For any population you test wherein the true positive rate is very low even a very low false positive rate will produce overwhelmingly false positives. Also yo

For any population you test wherein the true positive rate is very low even a very low false positive rate will produce overwhelmingly false positives. Also you could trivially have 1 bad guy with thousands of photos being accounted as 5,000 reports instead of 1 report listing 5000 images.