A two-judge bench, headed by Justice Ravi Tripathi and Justice R D Kothari, heard the contentions of one of the convicts and former state minister Maya Kodnani.
Kodnani's counsel N D Nanavati argued the trial court had erred in the judgement by believing in the testimonies of 11 witnesses whose statements he said are replete with contradictions.
There is no substantial evidence against Kodnani, which can lead to her conviction, said Nanavati.
There are around 100 appeals in the case, including those of the convicts and of the Supreme Court-appointed Special Investigation Team (SIT), besides those of the survivors who have sought enhancement of punishment of the convicts.
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The hearing is likely to continue on Monday.
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