there's still that thing of kuro using a robotic voice before his "death" like nijiro. I still have faith :qq: (I mean, dom still alive after stopping a sword with his head)
the PM and the bodyguards if there's any (wouldn't surprise me that the PM would be well versed in ninjutsu at this point). Even in the case of NIN infiltrating (an empty) office to plant recording/sabotage devices, sensors could also be bypassed, which doesn't make sense (that PM doesn't seem...
I think it's the safest way of detection, if you see a puddle splash by itself or a human figure being hit by rain drops you know that's NIN/UN. There's no more effective and simple way of seeing the invisible. Yes, tomographic and ultrasonic sensors are pretty much unavoidable too (you would...