So, the police claim they'll discover the truth eventually. Are they bluffing? Yes, they're bluffing. The police don't have all of the evidence if they're questioning you. When the police say, "We're going to find out anyway," that's just code for, "I really don't have evidence against you to convict you, but I want you to give it to me, and I want you to think that I'm going to find out anyway." When the truth really is he may never find out anyway, but he'll absolutely find out anyway if you talk to him. When the police say, "We're going to find out the truth anyway."