Child predators "communicate using virtually unbreakable encryption," US attorney general William Barr said during the press conference. Therefore you cannot. The predators are also drinking the water.
I guess this wouldn't impact distributed networks though the the side effects would be a mass movement to decenrrilised networks? Big tech companies are easy targets. They would have to make encryption unlawful altogether in order to attack decentralised network but then that would surly compromise https?