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


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


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.


People in this conversation

  • I have to say that I don't agree with the test because the Maxwell families stress level would be high due to the trauma of their loss. But I give them top marks for their participation.

  • I don't really understand how to interpret this evidence, so, I may be way off, but don't they say they ask a bunch of "easy" control questions to establish a base line? Does that mean that if a person are already anxious and upset that if the question make you more anxious and upset your number goes up, and if you are calm and your number goes up it proves something? If your anxious and stay anxious you have a neutral rating. I'm not saying this well, but one person's underlying base line can be different from another person, it's changes from that base that's measured? (Oh, my! I really am at sea on this!)
    I don't understand the high middle and low range stuff, how they can be so different. High is squeaking and low is growling? Oh my...:p

  • Okay Igillette, I don't know if you understood yet, but the 'easy' control questions are often questions that don't hit the major point. As in, questions like "How is the weather?" Or "Did you like xyz?" are used so that a baseline can be estimated. These baselines are used to determine how stressed one is in their daily life, and then the hard hitting question- "Did you kill..." and the reading from that response, or how stressed one gets from the death, determines the rating.

    Also cfp, you say that it's normal for their stress to rise because their family. Well, why is Robin's results the lowest of them all, and why is Ronny, non-family, fairly high then?

  • We are really going down the reply chain on this one!
    Thanks for the explination. Robin might have been drinking or she could be in shock. I think she spends a lot of her time vaguely "medicated". I would imagine that Ronny sense that this could all land on him as a likely suspect. His relations with the police have not been co-operative in the past. He could be very suspicious of a question like that, that he could get tagged.

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