Staff can enter unless it specifically says in the first post that they can't (like in the referral contest),
contest can't enter unless specifically says in the first post that they can
Mods can see the contest team area but are assumed to be trustworthy enough not to cheat, they can't see leader area however which is where we post answers to contest that contest team would be allowed to enter. Smods+ I think can see pretty much everywhere but again are trusted not to cheat.
Contest team can see the team area but are usually not allowed to enter unless it's a contest that doesn't have an actual answer - and even then only if it says they can.
So yeah, Tet and juju couldn't have entered being contest, but Mumei can even though he's staff
Any questions, just ask
Actually I might add this to the pinned topic...
also - i may be staff, but i don't have access to any of the areas that you've just mentioned, i am only a mod in the programming section (not that i would dream of cheating anyway)