Siya-Ketan case: As police seek polygraph nod, how ‘lie-detector’ tests work - and don’t

A polygraph test is based on the assumption that physiological responses triggered when a person is lying are different from what they would be otherwise. The test uses instruments such as cardio-cuffs or sensitive devices to measure these responses. The polygraph test is largely seen as an unreliable tool to detect deception. In India, such a test can only be done with the consent of the person on whom it is to be conducted. The test is used to measure physiological responses such as heart rate and blood pressure, which are believed to change when a person is lying. The results of the test are not considered as evidence in court and refusal to undergo the test also cannot be held as an adverse inference against the accused. The polygraph test has been used in various cases in India, but its reliability has always been a topic of debate. The test is considered to be a tool to aid in investigation, but it is not considered to be a foolproof method of detecting deception. The Indian legal system has laid down guidelines for the use of polygraph tests, which include the requirement of consent from the person being tested. The test is considered to be a useful tool in certain circumstances, but its limitations and potential for inaccuracy must be taken into account. The use of polygraph tests in India is subject to certain rules and regulations, which are designed to protect the rights of the person being tested. The test is considered to be a complex process, which requires specialized equipment and trained personnel. The results of the test must be interpreted carefully, taking into account the various factors that can affect the outcome.