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Prosecutors and Judges Push for Ban on 911 Call Analysis:

The technique’s chief architect, Tracy Harpster, developed a program to spread his methods and says police and prosecutors who take his training will learn how to identify guilt and deception from the word choice, cadence and grammar of those calling 911. So far, researchers who have tried to corroborate Harpster’s claims have failed.

Last year, ProPublica documented more than 100 cases in 26 states where law enforcement has employed his methods. Those responsible for ensuring honest police work and fair trials — including the FBI — have instead helped 911 call analysis metastasize. The investigation revealed that some prosecutors knew 911 call analysis would not be recognized as scientific evidence but still disguised it in trial against unwitting defendants anyway.

During the reporting for the two stories, Harpster at first defended his program but then did not respond to repeated interview requests or detailed lists of questions. Supporters of his work in law enforcement have said 911 call analysis is a valuable investigative tool but not decisive evidence on which to base a conviction.

On Wednesday, he and Susan Adams, who co-authored the original study the technique is based on, sent a letter to ProPublica and argued its coverage had “presented an inaccurate narrative” and listed material they claimed to be omissions and misrepresentations. They asked that their letter be published. ProPublica is also publishing a point-by-point response.

https://www.propublica.org/article/911-call-analysis-ban-review-convictions

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