Blood stains on chappals, door pad of vehicle, shirts and weapons used by the accused proved crucial in building scientific and medical evidence to establish the role of the convicts in the brutal murder of Youth Congress workers Kripesh and Sarathlal at Kalliyot near Kasaragod's Periya in 2019.

As many as 83 material objects were produced in the court for examination, and the prosecutor relied on this to furnish scientific evidence. The prosecution also used one of the accused's self-admissions about how he sustained the injury on his finger to prove the accused's direct involvement in the crime.

Two GI pipes, a heavy iron rod, a square metallic pipe and a rusted metallic sword without a handle recovered following the crime contained traces of human blood, and the DNA was matched with that of Sarathlal. Blood was found in another sword, a bent one with sharp edge and the DNA derived from it matched that of the DNA of both Sarathlal and Kripesh.

The blood stain collected from the door pad of a Swift Dzire car, from the chappal of the second accused, Saji C George, and from the shirt of the third accused, Suresh K M, also produced DNA matches with that of the deceased.

Two material objects included broken pieces of wooden handles, which again contained blood stains, and Sarathlal's DNA was extracted from these objects. The scientific office also noticed cut marks and dents on a motorcycle and stated that only a sharp-edged object could produce cut marks.

An admission made by the third accused, Suresh K M, during the medical examination, was also decisive. He told the doctor that he sustained injuries on his finger while attacking the deceased with the sword.

The handle of the sword got damaged, and he sustained the injury. This was included in the medical certificate, and again, when the third accused was produced before the same doctor for examination before he was produced in front of the Magistrate, he stated the same fact and both the entries were made by the doctor.

Expert witness Dr S Gopalakrishna Pillai, who conducted the autopsy of the bodies of Sarathlal and Kripesh, showed that Sarathlal died of multiple chop wounds sustained to his head and limbs.

He stated that the injuries were caused by long, sharp weapons like swords, adding that the swords used for the murder could individually produce the single chop wound found on the head of Kripesh and all the chop wounds and incisions found on the body of Sarathlal.