The reason why I'm having us pass through the C-SEC security checkpoint is for a couple of reasons.  One, to make sure no one smuggles in any unknown or otherwise dangerous weaponry, and two, to get a thorough scan of the newcomers so that they're logged in the computers and all that, and to also give a ten thousand credit account for just walking in the Citadel.  Creds are the electronic form of money, and so it's very hard to steal money unless you carry it around in a credit chit of some sort, but I digress.