> A black box detector that similar to a trained drug dog will bark on command. Absolutely. There is never any description given of the required false positive

> A black box detector that similar to a trained drug dog will bark on command. Absolutely. There is never any description given of the required false positive rate, or the way it will be measured and enforced. A false positive rate of 1% across ~450M people, to find 3M abusers (assuming each abuser averages two victims based on the article’s figures) of which only 1% exchange images insecurely, would mean that 0.8% of detections would be valid. The police cannot chase 125 dead ends for a single arrest; they just don’t have that kind of budget. They already give up on finding bike thieves even when the bikes are GPS’ed within town, and that would have a much higher probability of success per investigation.