חוקר פרטי דיטקט חקירות
החוקרים הפרטיים ממשרד חקירות דיטקט מומחים בביצוע חקירות בארץ ובחו”ל בתחומי חקירות שונים | מודיעין עסקי תחרותי והגנתי, חקירות כלכליות ואיתור רכוש ונכסים, חשיפת בגידות בתיקי גירושין, מעקבי עובדים ומניעת פחת, בדיקות פוליגרף ועוד. עם ותק וניסיון מצטבר של למעלה מ 30 שנה, חוקר פרטי ממשרדינו ישמח לעמוד לרשותכם לשיחת ייעוץ והכוונה.  פנו אלינו בדיסקרטיות מלאה 050-5501024
חקירות

Polygraph


Polygraph Investigation Services

A polygraph allows investigators and law enforcement to determine whether the person being interviewed is telling the truth or not. Invented in the 20thcentury, the device works by reading physical reactions. A polygraph test can be used to confirm a specific inquiry or as a general credibility check.

A polygraph test, also known as a lie detector test, is a method of detecting deception through the use of physiological measurements. Polygraph tests are often used by law enforcement agencies, government agencies, and private employers to screen job applicants or to investigate allegations of wrongdoing.

During a polygraph test, the person being tested is connected to a machine that measures several physiological indicators, such as heart rate, blood pressure, and respiration. The person is then asked a series of questions, and the polygraph machine records the physiological responses to each question. The theory behind polygraph testing is that when a person is lying, they will experience a physiological reaction (such as an increase in heart rate or blood pressure) that can be detected by the polygraph machine.

It is important to note that polygraph tests are not foolproof and are not admissible as evidence in all legal proceedings. The accuracy of polygraph tests is a matter of some controversy, and there is ongoing debate about the reliability of these tests.


polygraph Test executed

Electrodes are placed on the person being interrogated, indicating the involuntary physical reactions that indicate whether they are telling the truth. These indicators include increased blood pressure, a faster pulse, and other physical changes, all of which can be detected by the polygraph.


Using the Polygraph

The polygraph is most commonly used by policemen during criminal investigations. Insurance and credit card companies use the polygraph when they sue or they’re being sued. Many private companies and organizations-especially in the fields of money, security, or military-require potential workers to take a polygraph test.

Polygraph

The lie detector tests are usually conducted by authorized personnel from a security company or Intelligence & Investigations company.


Court confirmation to perform a polygraph test

The court can order a polygraph test as part of an ongoing investigation or case. In the event that a private company wants the test as part of a pre-employment check, there is no need for a court order/


Conducting a polygraph test

A polygraph test can be instrumental in uncovering falsehoods or confirming the accuracy of information. Some businesses require their employees to take periodic polygraph tests as a means of preventing illicit behavior

 

questions asked in  polygraph test

The questions asked during a test vary widely based on the type of information the interviewing entity wants to know.


The Polygraph test

A polygraph test must occur at an authorized location. A member of law enforcement conducts all police-related tests, but work-related testing or interrogations are performed by an investigation office.

 

how a polygraph test is done?

A polygraph test, also known as a lie detector test, is a procedure used to detect deception by measuring physiological responses that are believed to be associated with truthfulness or deception. It’s important to note that the accuracy and reliability of polygraph tests are a subject of debate within the scientific community, and their results are not always considered conclusive.

Here’s an overview of how a typical polygraph test is conducted:

Pre-Test Interview: Before the actual test, the examiner conducts a pre-test interview to discuss the test’s purpose, explain the procedure, and develop a rapport with the person being tested (the examinee). The examiner will also gather information about the examinee’s medical and psychological history.

Question Formulation: The examiner formulates a series of questions, typically categorized as relevant, irrelevant, and control questions. Relevant questions pertain to the specific issue being investigated, while irrelevant questions are unrelated. Control questions are designed to evoke a strong physiological response from someone who is attempting to deceive.

Sensors and Monitoring: During the test, the examinee is attached to a polygraph machine that records physiological responses. Common sensors include:

Pneumography: Measure chest movements and breathing patterns.

Cardiovascular sensors: Record heart rate and blood pressure.

Galvanic skin response (GSR): Measures skin conductivity, which can change with sweat production.

Electromyography (EMG): Monitors muscle activity, typically in the face and neck.

Baseline Testing: The examiner conducts a baseline test to establish normal physiological responses while the examinee answers a set of neutral questions. This helps establish a baseline for comparison during the critical questions.

Questioning Phase: The examiner asks a series of relevant and control questions while monitoring the physiological responses. The idea is that truthful answers to relevant questions should not produce as strong a response as deceptive answers. Control questions are used to create a contrast in physiological reactions.

Analysis: The examiner analyzes the data collected during the questioning phase to determine if there are significant differences in physiological responses between relevant and control questions. Polygraph results are often presented in the form of a chart known as a polygraph chart or polygram.

Interpretation: The examiner interprets the results and renders an opinion regarding the truthfulness of the examinee’s responses. However, it’s essential to understand that polygraph results are not infallible, and false positives and false negatives can occur.

It’s worth noting that the use of polygraph results as evidence in legal settings varies, and the admissibility of such evidence is subject to legal and jurisdictional considerations. Additionally, many experts caution against relying solely on polygraph results due to their limitations and potential for error.

 

Who conduct a polygraph test

Polygraph tests are typically conducted by trained and certified polygraph examiners or polygraphists. These professionals undergo specialized training to administer polygraph tests and interpret the results. The qualifications and certification requirements may vary by jurisdiction, but examiners often receive training from accredited polygraph schools or organizations.

The American Polygraph Association (APA) and the American Association of Police Polygraphists (AAPP) are examples of organizations that provide training and certification for polygraph examiners in the United States. In other countries, there may be similar organizations or government agencies overseeing the certification and standards for polygraph examiners.

Law enforcement agencies, government organizations, private companies, and individual practitioners may employ polygraph examiners. In some cases, polygraph examiners work independently as consultants, providing their services to various clients on a case-by-case basis.

It’s important to note that the use of polygraph tests and the qualifications required for examiners can vary widely depending on the legal and regulatory context of the jurisdiction in which the test is conducted. Additionally, the scientific community generally does not universally endorse the reliability of polygraph testing for accurately detecting deception, and the results are often considered supplemental rather than definitive evidence.


can you fool a polygraph test ?

Attempting to fool a polygraph test, also known as “beating” or “counter measuring” the polygraph, is possible, but it is not a guaranteed or straightforward task. Polygraph examiners are trained to detect common countermeasures, and the effectiveness of such efforts can vary.

Here are some common methods people may try to use to deceive a polygraph, but it’s important to note that the success of these methods is not guaranteed, and attempting to manipulate the results of a polygraph test can have serious legal consequences.

Controlled Breathing: Some individuals try to control their breathing patterns to maintain a consistent response during both control and relevant questions. However, skilled polygraph examiners are trained to detect such deliberate efforts to manipulate respiratory patterns.

Mental Countermeasures: Individuals may use mental techniques, such as imagining calm or stressful scenarios during control questions to influence their physiological responses. Again, examiners are trained to recognize patterns indicative of intentional manipulation.

Biting the Tongue or Engaging in Painful Thoughts: Some people may try to induce pain or discomfort to alter physiological responses. However, examiners are typically aware of these tactics and may look for signs of physical discomfort.

Medications or Substances: Some individuals may attempt to use substances, such as drugs or alcohol, to influence their physiological responses. However, this is not only illegal but can also lead to unpredictable and potentially dangerous results.

It’s essential to understand that polygraph examiners are aware of these and other potential countermeasures. Moreover, modern polygraph instruments often include features designed to detect and minimize the impact of deliberate attempts to manipulate the test.

If you are facing a polygraph test in a legal or employment context, it is advisable to consult with legal professionals to understand your rights and responsibilities. Attempting to deceive a polygraph test can have serious consequences and may not be an effective strategy.

 

 

דילוג לתוכן