This issue at London Heathrow Airport certainly speaks to issues associated with both physical security and the potential for insider threats.  It is an eery reminder of the potential damage associated with lost or stolen portable media as well.

https://www.infosecurity-magazine.com/news/security-alert-usb-containing/

https://nakedsecurity.sophos.com/2017/10/31/london-heathrow-airports-security-laid-bare-by-one-lost-usb-stick/