the tapes is admissible. whether it should even get into court. the two experts that the defense -- that the state brought on have really been slammed by the other experts. some world renowned experts saying they were using untested, unreliable and unscientific standards when they say the -- the states witnesses are saying they should be using them. >> do you think it will be allowed or not and does that give a huge advantage to one side or the other? >> it does give an advantage if it's left out. i hate to sound like a lawyer, but it's 50-50 on this one. the judge wants to be fair and let the jurors evaluate which side they want to give credibility to, but it's an appealable issue, and in the event of a conviction when they have witnesses using untested standards. >> mark, the zimmerman appeared in court today. i believe this is the first