When the enemy team runs a spy and does voice commands, I can see that it is not my teammate using those voice commands. They are either of the color of the other team or of the name of the spy. (I can't remember which one because I do not play this game as much anymore. People rarely run spy.) This has saved my ass many times.
I don't know if this is intentional but no one has ever mentioned this. Can anyone confirm? Thoughts?