[1986titans]

As far as I know, there's nothing about scanners in the manual and the only thing that comes close is 4.15's "Do not use walkie-talkies". Based on that, it'd lead me to believe that scanners are allowed since they are simply for listening. You could make the case that if scanners aren't allowed, they shouldn't allow AM/FM radios either because they essentially do the same thing - monitor a specific frequency for communication, but that might be a bit of a stretch.

... but all we can really do on Chief Delphi is guess. If you really want to pursue this (even if it doesn't sound like there's much to listen to), ask on the Q&A.