Can search results be restricted based on login credentials?

Yep. FUSE can show a filtered view so that non-members/subscribers cannot view search results that have member/subscriber only content. Each FUSE client makes the determination on what content can appear in a search. We recommend showing abstracts of all of your content in your results, however, so non-members/prospects can see what content is available (FUSE does this out of the box). You can also provide filtered views at a micro-level - for example, Board of Director meeting notes can be excluded from ALL searches or available only to board members (based on their status in your database).