To be clear in one building there were a few thousand people working. When I visited myself and maybe a dozen or two dozen other people in the building had access to the data center. Cameras everywhere, appointment verification, IDs, man traps and all.

I'd visit and go up to the doors and passers by would stop to watch "he's going inside..."

Whatever a random drone was doing with their laptop, that's a whole other issue / policy.

It was even more fun at military sites. NOTHING non essential ever left. You, your ID (they held it), your clothing, glasses... that was all that came out, your laptop and any spare parts were left behind every time. If you went to the very special sites... you also made sure nothing was in your car that you didn't want to lose.