Physical Danger
You may find yourself in a room with some psychopaths from time to time.
Giving a poly to Hannibal Lecter, for instance, wouldn't be a picnic. (Well, maybe for him it would be.)
For the most part, you won't be dealing with anyone that dangerous. You'll mostly be quizzing science geeks and engineers who work for the government, folks accused of corporate espionage, cheating spouses, and low-level criminals out to clear their names.