Rocky Yadav's mother and suspended Janta Dal United legislator Manorama Devi was sent to 14-day judicial custody on Tuesday morning.
She was arrested after the police found bottles of liquor at her house in Gaya when they were searching for her son, who had gone into hiding after allegedly killing 20-year-old Aditya Sachdeva for overtaking his SUV.
She has been sent to the judicial custody for violating the new prohibition law in Bihar.
"The information is false, no liquor bottles were found in my house," she said in a statement today.
"I am being falsely implicated under political conspiracy, BJP is doing that," she added.
Meanwhile, a Gaya court on Monday deferred the hearing on her anticipatory bail plea.
The suspended MLC had filed an anticipatory bail plea in the court on May 13.