Look upon this sentence please:
"But again, truth be told, if you're looking for the guilty, you only need to look into a mirror."
The sentence isn't in the subjunctive mood, because there's no appropriate verb/adjective needed to make a subjunctive mood in advance in the sentence. (like verbs, say, suggest, recommend, insist and adjectives like important, essential, imperative, crucial)
It's not an imperative one either.