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The investigation team suspects that Anil, the primary accused, initially left Kala's body in the septic tank with the help of his accomplices but later secretly removed it.
It's for the first time in the district the police have used gait analysis in an investigation.
The mafia normally targetted families of alcoholics.
A fresh probe has been launched into the incident from April in light of the development.
Legal experts point out that with the State Lab losing the NABL accreditation, the authenticity of their forensic examination reports gets challenged in the courts.
The plastic bottle containing petrol suddenly caught fire killing T V Prajith and his wife K K Reesha, states the report.
Rat poison, in the form of paste, apparently affected her liver, which resulted in the death.
Crime Branch officials want to confirm whether the letter which appeared in the Mayor Arya Rajendran's name and addressed to CPM' Thiruvananthapuram district secretary Anavoor Nagappan was prepared on the seized computers.
The Crime Branch action comes amidst allegations that it is going slow on the probe into the letter row.
An official also said that police have seized Sharma's co-actor Sheezan Khan's mobile phone and clothes which he wore on the day of the incident.