No one can really do that.
The kind of pure truth the court is asking for can't exist if its coming from one POV. Pure truth requires a kind of objectivity most people don't have. Personal beliefs shape how we see the world. Heck, journalists have a hard time separating themselves from a story completely. Some just said "F^%k it," and let their beliefs flat-out manipulate facts (see MSNBC and FOX NEWS).
Truth is often the hardest thing to hear. That's why we lie. That's why we delude ourselves. We're not God, or Allah, or Jesus, or anyone in their league. We look at someone who is completely honest with a mix of respect, and a feeling that somethings wrong with them. That's the truth.
Then again, I'm not a reliable source, am I?