to be an advocate for their client, to be an officer of the judicial system, and to respect the need to seek the truth within a system that places justice as its core value. The first role creates no ethical problems for a defense lawyer who knows their client is guilty. The second is a little more muddled. If a lawyer knows their client is guilty and the client pleads not guilty, the lawyer must not represent them, as allowing the client to give evidence while pleading not guilty means the lawyer is knowingly allowing their client to commit perjury.