Just found this article on a Google Court ruling last month about, amongst other things , what Google has the right to exclude from search results.
Google Wins Some and Loses Some in Florida SEO Case
"The ruling states, ?According to Google, it is immune from liability under the CDA for any actions it took as a publisher, and deciding what content to block or remove from Google?s search engines is quintessentially a publisher action.?
"While the statute was meant to protect children from porn, Google took the ?otherwise objectionable? clause literally as a sort of catch-all to give them broad leeway in de-indexing any website without reason or explanation."