Personal electronics are off limits in environments where exfiltration is a concern. You put your personal devices into a metal cell at the entrance, and walk through a metal scanner, airport-style.
I've experienced this in a couple of factories that build consumer-grade devices; I can imagine this to be even stricter on places where stakes are higher.
I've experienced this in a couple of factories that build consumer-grade devices; I can imagine this to be even stricter on places where stakes are higher.