Voice stress analysis

YOKNAPATAWPHA COUNTY SHERIFF'S DEPARTMENT

Investigating Officer(s): Det. T. Armstrong, Det. S. Murphy
Incident No.: 000073-05A-2014
Case Description: Cameron & Caitlin Maxwell Homicide Investigation

Voice samples were obtained from some persons of interest to the Maxwell investigation for assessment. Some persons of interest were not available or declined to provide samples.

Subjects were asked a series of control questions to establish baseline laryngeal microtremors affecting vocal pitch, and were then asked to say two test sentences relevant to the investigation.

These test samples were compared against the control samples to identify vocal stressors. Vocal stress frequency is said to increase relative to the baseline during possible dishonesty.

Voice stress analysis findings are not admissible in court, but can be a useful investigative tool in evaluating the veracity of a subject's verbal responses.


 


Todd Maxwell">


Todd Maxwell"> voice-dad
Todd Maxwell

 

voice-dad"My name is Todd Maxwell. I had nothing to do with the deaths of Cameron and Caitlin Maxwell."

Subject: Todd Maxwell 
Test Results: High Stress
 
Highest Frequency = 11.1 Hz
Lowest Frequency = 08.2 Hz
Average Frequency = 10.1 Hz

 


Robin Maxwell">


Robin Maxwell"> voice-mom
Robin Maxwell

 

voice-mom"My name is Robin Maxwell. I had nothing to do with the deaths of Cameron and Caitlin Maxwell."

Subject: Robin Maxwell 
Test Results: Low Stress
 
Highest Frequency = 09.2 Hz
Lowest Frequency = 08.2 Hz
Average Frequency = 8.7 Hz
 
 


Austin Maxwell">


Austin Maxwell"> voice-bro
Austin Maxwell

 

voice-bro"My name is Austin Maxwell. I had nothing to do with the deaths of Cameron and Caitlin Maxwell."

Subject: Austin Maxwell 
Test Results: Average Stress
 
Highest Frequency = 10.2 Hz
Lowest Frequency = 09.2 Hz
Average Frequency = 09.7 Hz
 
 


Ronald Sill">


Ronald Sill"> voice-sills
Ronald Sill

 

voice-sills"My name is Ronald Sill. I had nothing to do with the deaths of Cameron and Caitlin Maxwell."

Subject: Ronald Sill
Test Results: High Stress
 
Highest Frequency = 11.3 Hz
Lowest Frequency = 08.2 Hz
Average Frequency = 9.0 Hz
 
 

Stress Scale

12 Hz High Stress
11 Hz High Stress
10 Hz Average Stress
09 Hz Low Stress
08 Hz Low Stress

Results in the 11-12 Hz range is said to be an indication of dishonesty.

 


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