Like in Witcher 3?
I haven't played Witcher 3. But in SWTOR it's the Imperial Agent storyline. You're undercover as a double agent and are mind-controlled by the Republic spies so that whenever you report to the Empire, you can't report anything which would harm the Republic. So the dialogue wheel has options which would reveal the mind control or tell the Empire about the Republic's plans, but all that comes out is "Still investigating. Nothing to report." Stuff like that.