A deputy police chief "had a business to promote: a miracle method to determine when 911 callers are actually guilty of the crimes they are reporting. 'I know what a guilty father, mother or boyfriend sounds like,' he once said." HORRIFYING stuff here. https://www.propublica.org/article/911-call-analysis-fbi-police-courts
They Called 911 for Help. Police and Prosecutors Used a New Junk Science to Decide They Were Liars.

Tracing the fallacy of 911 call analysis through the justice system, from Quantico to the courtroom.

ProPublica
@MsKellyMHayes"Stripped of its context, a misplaced word as innocuous as “hi” or “please” or “somebody” can reveal a murderer on the phone." Why do I have a feeling we won't be hearing any fuss from the grifting "free speech" warriors about this?
@MsKellyMHayes I know what a lying cop sounds like: they're talking.