In this case, police said a child pornography image had been traced to Robinson’s home Internet address, and that was enough for them to get a warrant. […] « What was upsetting about it was that they should have known, » he says. Tor traffic is encrypted. Volunteers can’t see its contents, and it doesn’t leave a trace after it passes through an exit relay. He says the police seemed to imply that he shared responsibility for what came through his connection. […] Seattle police spokesman Sean Whitcomb says the department understands how Tor relays work, and they knew Robinson was a Tor host.