The amendment bill, introduced in the legislature by the state excise and narcotics minister J H Rothuama, was unanimously adopted.
Earlier Chief Minister Lal Thanhawla made obituary references on the demise of sitting legislator B Lalthlengliana, former Lok Sabha member Dr R Rothuama and former legislator Zoduha.
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One minute silence was observed to pay last respect to the departed leaders.
The monsoon session which commenced from today would continue till tomorrow.