Human brain is a garbage,it takes in lots of input both good/bad thinking & events,nacro test is made only to analysis the sequence of events on a persons brain,eventhough you train your brain to say a lie its difficult for a common man to handle.During the test,there would be lots of question which would be very difficult to anticipate for a common man to keep his lie.The person will be in a deep trance and even though he practises his subconscious brain to fake an event,there will be many more questions which he would not have thought of to tackle,that too in a trance he has no chance to fake it.Remember CBI has top class personals with huge realtime experience with them, they would dig it out with out a persons knowledge. For point 1. To me the Talwars would have been very busy professionals so that they have to believe the servant blindly to keep the routiens in their house. Hemraj was trusted so much by the Talwars, there is a possibility that Shambu and Krishna took advantage of Talwars trust on Hemraj. 2. After Talwars went to sleep, Krishna, Hem & shambu would have started their beer. 3. there would have been some noice which would have penetated a closed room with AC's on. 4. yes this is strange 5. she would have been alive even after taking that blow.hence they have decided to slit the throat,they would have been caught by surprise when the blood flew a distance.I guess the Talwars would have NOT involved in this crime.How come a parent kill their own daughter?
