Advantages and disadvantages of using polygraphs in criminal investigations
The use of the polygraph is a widely debated topic in the field of criminal investigations. This device, also known as the truth machine, is used to detect possible lies or deception in test subjects. While it can be a useful tool in some cases, it also presents certain limitations and challenges. In this article, we will explore the advantages and disadvantages of using the polygraph in criminal investigations.
1. Aid in lie detection: One of the main advantages of the polygraph is its ability to detect possible lies. The device records different physiological signals, such as heart rate, blood pressure and skin activity, and analyses them to determine whether or not the subject is telling the truth. This information can be useful to investigators in establishing the facts.
2. It can be an incentive to tell the truth: Subjecting a person to a polygraph can be an incentive for them to be honest. Knowing that their answers are being monitored and that any deception will be detected may lead the individual to be more truthful during questioning.
3. Provides an additional investigative tool: The polygraph can be used as an additional tool in the criminal investigation. Although it is not conclusive by itself, it can provide important clues that lead to the resolution of the case. Combined with other evidence and testimony, it can help to obtain a clearer picture of the facts.
1. Fallibility and margin of error: While the polygraph is a useful tool, it also has its limitations. There are cases where the device has detected false statements or given contradictory results. These errors may be due to a variety of factors, such as lack of experience or training of the examiner, subject anxiety, or environmental conditions.
2. Not 100% reliable: Despite its ability to detect possible lies, the polygraph is not infallible. The results can be interpreted in different ways, and not all liars are detected by this device. In addition, some people may be able to control their answers and fool the polygraph.
3. Ethical and legal issues: The use of polygraphs raises ethical and legal issues. Some argue that polygraphing may violate a person's privacy and human rights. In addition, in some countries, polygraph evidence is not admissible as evidence in courts of law.
In summary, the polygraph can be a useful tool in criminal investigations, but it is not the perfect solution. It has advantages such as lie detection and the incentive to tell the truth, but it also has disadvantages such as its fallibility and ethical and legal issues. It is important to use the polygraph responsibly and to supplement it with other evidence and testimony to obtain a more accurate and complete conclusion in a criminal case.
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- FAQ on the polygraph: [link to https://elpoligrafo.es/faq/].