Another person was held guilty on the basis of witness identification parade, while three others were acquitted.
Division bench of Justices P D Kode and V K Tahilramani last week upheld the conviction of Ejabool Jan Mohammed Shaikh and Kathalya alias Ramesh Raja Chavan on the basis of identification parade and 'dog tracking evidence', respectively, and sentenced them to life imprisonment.
Upholding his conviction, the High Court said, "It is scientifically accepted that dogs are rated as extremely intelligent animals and that some of their sensibilities are very highly developed and are extremely reliable."
All the accused had been convicted by Sewri Sessions Court here in 2007, and were given life imprisonment.
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The prosecution's case was that in the early hours of January 19, 2003 the accused entered the ground-floor house of Vishal Mehta at Mamta Cooperative Housing Society in suburban Ghatkopar. They killed Vishal's father Nautam, mother Hansaben and brother Jay in sleep by hitting them with an iron rod.
Before entering the house, they had also murdered the watchman in the building compound.
Some residents who lived upstairs saw a group of men standing in the compound. When they raised alarm, the men ran away and police were informed.