So to counter it they need to provide evidence it is Martin yelling to counter two witness's...Zimmerman & the person that placed the 911 call...so does a 48 % it Zimmerman vs no % its Martin be because not tested yet disprove it Zimmerman per two witness's?...
There could also be screaming/yelling/crying from others on the various calls, including children of the callers. Unless that possibility was ruled out or accounted for the voice analysis is flawed.