CBI seems to know more than they reveal to the press. Unless they are so much confidant they could not have arrested compounder Krishna ,the first person CBI has arrested ,since they took up the case. Dr.Talwar , the victim Aurishi's father was arrested earlier by UP police. It could be safely presumed that compounder might have used nontoxic sedatives in the food of Dr.Talwar so they slept through the murders in just another bedroom of their own house.
Only compounder can do this because he has access to the house and also he should have knowledge of the sedatives.
Under chemical injection narcotics influence you will speak truth. Only very few criminals with tremedous control on ther brain functions can cheat a narcotic lie detector test. But if that were the case he/she would not become an ordinary criminal.
So now CBI only has to collect independant evidence to corroborate their narco -analytic lie detector test dialogues. It is because they are not as such admissible in a court of law. About Dr.Talwar, CBI could not get doubt even after so many lie detector tests and that is the reason CBI started concentrating on the compounder Krishna. UP police did not collect evidence properly and there is a probablity that they might have been paid high amounts of money by some businessman. why not? CBI could not establish motive for the murder and that holds the key to the mystery.
