It's just tranquilizers to make sure that we knock them unconscious instead of lasers or something. [ You remember the lasers, Otonashi. ]

Kidnapping droids, anyone we accidentally piss off, anyone trying to sneak in. If someone wants to come into our headquarters, they'd better be a member or have a guest pass. It'd be pretty cool if we could get a finger-printer or some kind of retinal scan huh?