We cannot establish a rule stating "only admins can do 'x' action", that just wouldn't be fair. And some admins would also kill using the switch in sorrento.
My best bet to tell you is keep an eye out, warn before the start of round, and if someone does kill a teammate with the switch, then sit in spec. Follow everyone, and follow to that spot in free-mode and just keep on that 1 guy who is around the switch.

It can happen quickly, and that's why there is SourceTV. If it seems to tedious of a process, let me know the day/time and i'll take a look at the demo.