"Light fixtures would be my call, if they're going low tech or they've had to retrofit in a hurry," Kaidan answers, comfortable enough with this shop talk to suggest he's had at least an introductory course along the way. "If they knew to expect guests, there's no use speculating without scanning equipment, because you'll never find it, given the range of options out there. And then from there you can get really paranoid, if you're feeling bored: light fixtures, as an obvious find so that we discover the bugs and then don't bother looking for anything else."