Accompanied by director, mid-day meal programme, R Lakshamanan, Sinha said based on the studies, the state government in April held a training for principals and cooks to the maintain standard of cleanness in food for the scheme.
Earlier in the day, Union HRD minister MM Pallam Raju said warnings were issued to 12 Bihar districts including Saran where the tragedy occurred after some shortcomings in the implementation of the programme were identified.
Sinha repeated the remarks of education minister PK Shahi on Wednesday that the food was poisonous as confirmed by presence of organic phosphorous.
The case seemed to be one of poisoning of food and not food poisoning, he stressed.
"Insecticide was mixed in large quantity in the oil used for cooking food or it seems that the food was cooked in the insecticide," Sinha said.
The presence of organic phosphorous was clinically confirmed by doctors, he said.
"The report of the laboratory test of the food is expected tomorrow (Friday) which will give a final verdict over the issue," he said.