The court said the evidence produced by them in support of their plea of alibi was "inconsistent and contradictory" in nature and prosecution evidence overweighted their version.
Convicts Pawan Kumar Gupta and Vinay Sharma had claimed that on the evening of December 16, 2012, they were in the DDA District Park in Hauz Khas area of South Delhi watching a musical event organised in connection with Christmas celebration and they were not in the bus and had not committed any offence with the woman or her friend.
A three-judge bench, headed by Justice Dipak Misra, said their plea "appears to be an afterthought and rather may be read as an additional circumstance against them."
The bench, also comprising justices R Banumathi and Ashok Bhushan, said when a plea of alibi is taken by an accused, the burden is upon him to establish the same by positive evidence after the onus regarding his presence on the spot is established by the prosecution.
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Considering the "inconsistent and contradictory" nature of the evidence of alibi led by the convicts against the positive evidence of the prosecution, including scientific, the bench held that they have miserably failed to discharge their burden of absolute certainty regarding their plea.
It also said that the video clip brought in by Vinay, showing that he was present in the park on the evening of the incident, appeared to have been tampered.
Regarding Akshay, the bench said the defence witnesses brought by him were his relatives including his wife and, as observed by the trial court and high court, they tried to wriggle him out of the messy situation, as is the natural instinct of the family members.