When you arrived everything was searched, you were blindfolded, driven and walked blindfolded until you were right in front of the rack of equipment to work on. Even a trip to the bathroom was accompanied by a soldier.
Laptop, hardware, all was left behind when you were done.
I remember thinking "pretty smart, that's pretty secure".
Now I don't think there's any other way than to keep personal mobile devices out of the loop.
And for people of high rank ... I gotta think their kids / family mobile devices are a target too, pickup something over dinner discussion maybe.
We've kinda bugged ourselves with these things.
Also "android" could mean any number of devices with their own old software / security flaws.