A sensational double murder and a thousand and one theories -- This is how one could describe the day at the Bowring Hospital in Bangalore where the narco-analysis test on Krishna, the compounder in Dr Rajesh Talwar's clinic, was conducted in connection with the Aarushi-Hemraj murder case.

Coverage: Aarushi Murder Case

During the scientific tests that lasted the entire day, various theories regarding the case came up. While some maintained that the CBI had not made any breakthrough in the case, some investigating officers said they will be able to corroborate the evidence based on the questioning done on Wednesday and the scientific tests conducted on Thursday.

Sources told rediff.com that Krishna was unable to give information during the test regarding the weapon that was used to commit the murder.

However, Krishna is said to have told the investigators during the test that Dr Talwar looked nervous during the last days of Aarushi and Hemraj.

There were also instances when he was asked to leave the clinic, Krishna is said to have claimed during his tests.

Krishna was brought to Bangalore by the CBI and scientific tests were conducted on him.

Prior to the tests, he was questioned by the CBI on Wednesday. Following the questioning the CBI had found that Krishna had not contradicted himself while answering the questions.

Sources in the CBI said all the statements were corroborated by Krishna. The investigating agency felt that the case may not have been that of honour killing after all. They are also trying to find out whether Krishna was the main killer or was he just an accomplice.

However, the trouble for the CBI began when contradictory versions were given by Krishna during the scientific tests. The CBI, according to sources, have three versions regarding the weapon.

It is said that Krishna may have tried to conceal information and during the questioning, brain mapping and narco analysis had three separate versions.

The CBI, however, is certain that a 'khukri' (a curved Nepalese knife) was used to kill Aarushi. They are now joining the dots and are ascertaining whether the 'khukri' belonged to Krishna, who hails from Nepal.

Media advice:
The CBI did everything under the sun to ensure that the media was kept at bay. However, the media -- especially television media -- refused to budge and followed every move.

Minutes before Krishna was brought to the Bowring hospital, one CBI official came in front of the media and started speaking. As he was doing so, they tried to slip Krishna into the hospital. However, two cameramen chased him and managed to get a picture of his.

After the tests were concluded, CBI director Vijay Shankar had a word of advice for the media. He was tough particularly on the electronic media who, according to him, were running a parallel investigation. He warned the media to exercise restraint in the matter and said that the CBI should be permitted to do its work.