[ Bruce follows Kyle in, and flops down in one of those chairs like he owns the place - but he drops into a 'leaning forward, forearms on his knees' position, rather than an artful sprawl.

Meaning, though there's no comparison (yet), he's both engaged in the problem and not putting on an even metaphorical mask.

Kyle being a vampire isn't a thing that holds most of his attention, though 'happened here' is something he finds a little alarming. ]

I'm sorry; that must have been traumatic for you and people close to you. I'm not asking for abilities and commonalities so I can take advantage of them, though I won't pretend to be noting them. I'm looking for something I can use to create an automated security and screening system to keep people who don't need to use the resource out.

Speed and strength above human ability would work but that's not fool proof here. Body temperature or pulse range. ...Even amount of blood currently within an in individual's system could work, though it would keep out vampires who have recently fed.