Internet companies have the technology to stop most of the digital child abuse images circulating among paedophiles but are failing to do so, a senior police official has said.

The National Crime Agency said on Thursday that internet service providers must do more, as it disclosed significant increases in sexual attacks on and interest in children.
https://www.theguardian.com/society/2018/jun/21/internet-companies-can-should-screen-out-child-abuse-images