> Is it reasonable for the police to investigate an exit node operator for traffic coming from his node, even if they know he's an exit node operator?
In theory, you are right and the police would probably need to examine his servers to determine whether Tor was involved in this. In practice, they will probably just harrass people in the hope that they will confess and keep his servers for a long time (or forever) because they lack the expertise for such an investigation.
In theory, you are right and the police would probably need to examine his servers to determine whether Tor was involved in this. In practice, they will probably just harrass people in the hope that they will confess and keep his servers for a long time (or forever) because they lack the expertise for such an investigation.