The search came two days after a base model cellphone sans battery and SIM car was recovered during repairs to a pipe linked to a septic tank in the district jail.
Officials said they carried out a thorough search of the jail premises. 'As part of searching, we are also planning to open the septic tank', a top police official told PTI.
In a serious violation of prison rules, some of the accused in the Chandrasekharan murder case had made Facebook postings using their mobile phones.
Chandrasekharan, who floated his own outfit RMP after quitting CPI(M), was hacked to death in May 2012 near his native village Onchiyam. Many of the accused in the case are local CPI(M) workers, apart from hired goons.
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Meanwhile, the reported visit of CPI(M) MLA K K Lathika, to the jail, where her husband and an accused in the murder case, was lodged, soon after the Facebook episode surfaced, has fuelled another controversy.
Chandrasekharan's widow K K Rema, has demanded an inquiry into the visit of the MLA.
Kerala home minister Thiruvanchoor Radhakrishnan had visited the jail immediately after the incident and also constituted a three-member team to probe the issue.
Later, the government had also shifted DGP (Prison) Alexander Jacob from the post and ADGP T P Sen Kumar was given additional charge of DGP (Prison).