re: #17 Charles Johnson

The article cites two experts who independently came to the same conclusion, using different biometric analysis techniques.

No, the second expert is explicitly described as not using any biometric technique:

Not all experts rely on biometrics. Ed Primeau, a Michigan-based audio engineer and forensics expert, is not a believer in the technology’s use in courtroom settings.

He relies instead on audio enhancement and human analysis based on forensic experience. After listening closely to the 911 tape on which the screams are heard, Primeau also has a strong opinion.

“I believe that’s Trayvon Martin in the background, without a doubt,” Primeau says, stressing that the tone of the voice is a giveaway. “That’s a young man screaming.”

So basically he gave his subjective opinion. Not convincing.