The problem I have is that a contractor should not be allowed to bring in a USB dongle to plug into a machine onside. Hell the machines shouldn't have accessibl

The problem I have is that a contractor should not be allowed to bring in a USB dongle to plug into a machine onside. Hell the machines shouldn't have accessible USB ports at all. My other problem is that even if they are allowed to plug their personal USB stick into a machine, control computers should be completely isolated from the machines a random contractor would have access to. I mean seriously? Why would they even be able to talk to one another?