In criminal investigations, understanding how to assess witness reliability is...
Health & Medicine104 views·Updated Aug 25, 2026·2 pagesReliable Witnesses in Biomedical Science Activity 1.1.2
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kfontcha10@kfontcha10_mprd
1
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Persons of Interest and Polygraph Results
When someone dies mysteriously like Anna Garcia, investigators need to evaluate everyone who last saw her alive. The five persons of interest each have different relationships with Anna and potential motives.
The investigation focuses on physiological responses during questioning—these are involuntary biological reactions that might reveal deception. Key measurements include blood pressure, respiration rate (breaths per minute), skin conductivity (how sweat affects electrical conductance), and heartbeat patterns.
Each person underwent a polygraph test with interesting results. Eric Piedmont (Anna's boyfriend) showed suspicious responses when asked about his last meeting with Anna and whether he killed her. Dominique Hall, Anna's competitive classmate, displayed respiratory spikes when asked about their relationship. Taylor Diaz, who found Anna's body, showed significant reactions that could indicate either trauma from finding her or potential guilt.
Think About It: Polygraphs measure stress responses, not lies directly. Why might an innocent person still show "deceptive" readings when questioned about a friend's death?
Dr. Elsie Opal and Sam Greene also underwent testing with varied results, with Sam showing interesting heartrate patterns when discussing her relationship with Anna after their soccer argument.
2
of 2
Analyzing Witness Reliability
Evaluating witness statements requires more than just polygraph results. The investigator notes raise important questions about who had classes with Anna, recent suspicious activities, and alibis during the critical timeframe.
Taylor Diaz's extreme polygraph results might be explained by the trauma of discovering Anna's body rather than guilt. Meanwhile, Sam Greene emerges as a person requiring closer investigation due to her recent argument with Anna over a soccer game, giving her a fresher motive than Dominique's scholarship competition.
When evaluating polygraph data, remember that these tests aren't admissible in court. They're merely investigative tools that record physical changes in heart rate, blood pressure, breathing, skin conductivity, and perspiration. The baseline is established through simple "control questions" before moving to case-relevant inquiries.
Pro Tip: When analyzing polygraph charts, always check the y-axis scaling, as it varies between subjects and can make reactions appear more or less dramatic than they actually are!
Potential signs of deception include heart and respiratory rates higher or lower than the subject's baseline, but these aren't definitive proof of lying—just indicators that warrant further investigation.
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Health & Medicine104 views·Updated Aug 25, 2026·2 pagesReliable Witnesses in Biomedical Science Activity 1.1.2
K
kfontcha10@kfontcha10_mprd
In criminal investigations, understanding how to assess witness reliability is crucial. This study examines five persons of interest in Anna Garcia's death case, along with their polygraph test results and physiological responses that might indicate deception.
1
of 2
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Persons of Interest and Polygraph Results
When someone dies mysteriously like Anna Garcia, investigators need to evaluate everyone who last saw her alive. The five persons of interest each have different relationships with Anna and potential motives.
The investigation focuses on physiological responses during questioning—these are involuntary biological reactions that might reveal deception. Key measurements include blood pressure, respiration rate (breaths per minute), skin conductivity (how sweat affects electrical conductance), and heartbeat patterns.
Each person underwent a polygraph test with interesting results. Eric Piedmont (Anna's boyfriend) showed suspicious responses when asked about his last meeting with Anna and whether he killed her. Dominique Hall, Anna's competitive classmate, displayed respiratory spikes when asked about their relationship. Taylor Diaz, who found Anna's body, showed significant reactions that could indicate either trauma from finding her or potential guilt.
Think About It: Polygraphs measure stress responses, not lies directly. Why might an innocent person still show "deceptive" readings when questioned about a friend's death?
Dr. Elsie Opal and Sam Greene also underwent testing with varied results, with Sam showing interesting heartrate patterns when discussing her relationship with Anna after their soccer argument.
2
of 2Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Analyzing Witness Reliability
Evaluating witness statements requires more than just polygraph results. The investigator notes raise important questions about who had classes with Anna, recent suspicious activities, and alibis during the critical timeframe.
Taylor Diaz's extreme polygraph results might be explained by the trauma of discovering Anna's body rather than guilt. Meanwhile, Sam Greene emerges as a person requiring closer investigation due to her recent argument with Anna over a soccer game, giving her a fresher motive than Dominique's scholarship competition.
When evaluating polygraph data, remember that these tests aren't admissible in court. They're merely investigative tools that record physical changes in heart rate, blood pressure, breathing, skin conductivity, and perspiration. The baseline is established through simple "control questions" before moving to case-relevant inquiries.
Pro Tip: When analyzing polygraph charts, always check the y-axis scaling, as it varies between subjects and can make reactions appear more or less dramatic than they actually are!
Potential signs of deception include heart and respiratory rates higher or lower than the subject's baseline, but these aren't definitive proof of lying—just indicators that warrant further investigation.
We thought you’d never ask...
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
You can download the app in the Google Play Store and in the Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
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