Dawn Wells, 69, was pulled over in Teton County, Idaho, for allegedly swerving and repeatedly speeding up and slowing down after her birthday party last October, TMZ.com reported Tuesday.
Police said they recovered four half-smoked joints, as well as two small cases used to store marijuana, when they searched her vehicle, the report said.
Wells is said to have claimed the items were not hers but belonged to hitchhikers.
The actress pleaded guilty to one count of reckless driving and was sentenced last month to five days in jail, fined $410.50 and placed on six months unsupervised probation, TMZ.com said.
Idaho's KIDK.com said Wells was initially charged with Driving While Intoxicated, possession of drug paraphernalia and possession of a controlled substance but those charges were dropped in exchange for the reckless driving guilty plea.