Easy tactic to prove faithfulness

If I was a faithful I’d do this if people were doubting my honesty.

I’d go around to people saying ‘I’m a traitor’.

The faithfuls should know from previous series that Traitors cannot reveal their identity, and saying that phrase would do so.

Therefore it is impossible for Traitors to say ‘I’m a Traitor’ without being disqualified, proving I’m a faithful.