A court recently gave Delhi Police permission to conduct a polygraph test on Aftab Poonawala. The 28-year-old allegedly strangled his live-in partner Shraddha Walkar, cut her body into 35 pieces and kept them in a fridge for almost three weeks at his residence in South Delhi's Mehrauli after which he dumped the body parts across the city over several days. Police say that Poonawala confessed that after chopping the body, he burnt her face to conceal her identity. He also confessed that he had searched on the internet for ways to dispose of the body after murder.
A How accurate and legal is a polygraph test? A polygraph is a procedure that measures and records several physiological indicators, such as blood pressure, pulse, respiration and skin conductivity while a person is asked and answers a series of questions. The main motive of a polygraph test is to prove whether a person committed a crime. However, assessments of polygraphy by scientific and government bodies say that it is an imperfect or invalid means of assessing honesty.
The examiner typically begins polygraph test sessions with a pre-test interview to gain some preparatory information which will later be used to develop diagnostic questions. A polygraph test is conducted on an individual after instruments such as cardiocuffs or sensitive electrodes are attached to the person and blood pressure, pulse rate, blood flow, etc., are measured to check on the changes in the individual. According to each response that is recorded in numerical value, one comes to the conclusion on whether the person is telling the truth, is misleading, or is uncertain.
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