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Man Found Guilty of Child Porn, Because He Ran a Tor Exit Node
(lowendbox.com)
This is a most excellent place for technology news and articles.
One would not expect an exit node to be used for cp. A relay node would be more likely used for cp as one would expect the request to be internal to the tor network. A tor exit node is only used to access sites on the regular internet, not the "dark net"