I am wondering 2 things. 1. Why didn’t defense get into Treyvon jumping or beating anyone before? And 2. Why can’t any drug use of Treyvon come into this, which could of prompted him to snap?
You’re making the mistake that the Defense is the side presenting its case now. They will get their chance when the Prosecution is done.
What may be going on here is the prosecution is trying to get this expert to say it is impossible to tell what voice is screaming, to refute a expert by the defense who may claim he can tell...the defense expert may have other recordings of Martin from social media, whereby he can match and identify Martin.
Remember this witness said he only had recordings on CD’s that were sent to him.
The "judge" already ruled in pre-trials Zimmerman can't use anything about what a hood St. Skittles was before he became the decedent.