Big Head Zach
Can out of faction Agenda be used? Where does it say in the rules?
Currently you cannot use out of faction agenda, because all of the faction-specific agenda thus far have no Influence Point marker, and the rules state that a faction card without an Influence Point marker cannot be used out of faction.
(Notice the neutral Agendas DO have IP markers, all showing 0.)
We may yet see agendas that can be splashed, but for now there aren't any.