Generally speaking, you should always consult with an attorney prior to talking to the police in any situation. In any interview with the police you are at a strategic disadvantage. The police will almost always have more information than you and may be just trying to get a few additional nuggets of evidence they may need. The police are not required to tell you what evidence they may already have, and they can actually LIE to you by feeding you misinformation just to see how you react and to try to trick you into saying something incriminating. In order to protect yourself from this kind of trickery, you should speak with a lawyer prior to agreeing to any interviews with the police.