The Laurel County Sheriff’s Office says she had white power around her nose.
Whitney Nantz and Terry Browning were arrested Monday morning in the parking lot of Bush Elementary School.
Deputies say they pulled browning over because he was driving erratically.
They say Nantz and her 5-year-old were also in the truck.
Investigators say Browning and Natz admitted they had done drugs as recently as last night.
The child was not buckled up or in a booster seat deputies say.
Social Services were notified.