So, to pose the obvious question: Should there be?
(I honestly don't know the answer is to this question, and am asking in
earnest for opinions on the subject)
Well, calling the law on someone is kind of the whiner's way out anyway.
It would seem that the community could agree on a set of standards for
dealing with such problems and if you don't agree to those standards,
nobody routes your traffic. In other words, if network A finds network B
announcing allocated space belonging to network A and network A makes them
(network B) and their upstream provider(s) aware and they refuse to stop
the announcement, there should be a mechanism by which the community can
agree to filter Network B's AS *and* the AS of the upstream(s) until the
situation is rectified. That's a pretty big hammer but verifying someone's
legitimate claim on address space isn't that hard, in most cases.