Aarushi Murder Case

On may 16 Aarushi Talwar, daughter of a dentist couple was found dead with her throat slit in the bedroom of her flat in Jal Vayu Vihar in Noida
This is a big same for noida, basically CBI and Police that they does't found victime of Aarushi murder case.
CBI make NARCO test for her father DR Rajesh Talwar then her mother then Rajesh Talwar’s compounder Krishna and then.................but does not get a better result yet.
What is NARCO test?
In a Narco test the subject is administered a fixed quantity of Sodium Pentothal or Sodium Amytal which puts him/her in a state of Hypnotism. Such a test is generally conducted on a suspect who is not coming out with the truth. Once put to this test he is half sleep and answers the questions truthfully. However this test can not be taken as an evidence in a court of law. But certainly it helps proceed in the right direction and collect evidence which can form the basis for prosecution in a court of law. It is not possible for the subject to lie when administered the dose.
Abuot NARCO test docters says that this test never fails, if this is true then what happen here?
Whats happen in this case don't know any body yet then who killed Aarushi, or it may be clear that either police is hidding in this case or have some political presser or trying to search somthing in dark? We have a lot of confustions about this murder case because we dont know that what happen in this case........who killed Aarushi?
Let finally if CBI/Police solved this case and got the right victime, but what happen about Aarushi, his parents? Today Aarushi is not here but we will remember him, her voice her memories....................