Meena Devi, the principal of a Bihar school where 23 children died after consuming poisoned food last month, underwent a lie detector test on Thursday, police said.
A day after Meena Devi was taken on police remand, a team of the Patna-based Forensic Science Laboratory (FSL) along with two experts from New Delhi-based Central Forensic Science Laboratory conducted the polygraph test at Saran.
Saran Superintendent of Police Sujit Kumar confirmed that the Special Investigation Team, which is probing the case, conducted her polygraph test after a medical check-up.
“She has been subjected to the lie detector test,” he said.
Meena Devi, principal of the government primary school at Gandaman village in Saran district, was arrested last month and sent to judicial custody till 5 August by a court in Saran. She is named as an accused in the case.
According to SIT officials, the FSL also prepared a questionnaire for the purpose.
The SIT last Tuesday filed a petition before Chief Judicial Magistrate AK Jha and prayed for four day police remand to conduct polygraph test on her.
She had earlier claimed innocence and denied her involvement in the tragedy.
A First Information Report (FIR) was registered against her on charges of murder and criminal conspiracy, police said.
Meena Devi, who was suspended from service for gross negligence, had been on the run since the day of the incident 16 July, police said.
Police raided her house twice and recovered a bottle of pesticide whose traces were suspected to be present in the meal.
According to district officials, Meena Devi had forced the cook to use an allegedly contaminated cooking oil despite the latter’s complaint that it had a pungent smell.
A forensic lab report confirmed presence of toxic insecticide traces in the cooking oil used for making food at the school, police said.
The poisonous substance, organophosphorus, in oil samples collected from school was more than five times the commercial preparation available in market, police added.