A longtime South Dakota supporter of legalized marijuana has been sentenced to serve 45 days in jail for possessing the illegal drug.

Authorities say Bob Newland of Hermosa was found with four bags of marijuana, a scale and $385 in cash when he was stopped for speeding in March.

He pleaded guilty in May to a possession charge under a plea agreement in which prosecutors agreed to drop a more serious charge of possession with intent to distribute.

Newland will be on probation for the rest of the year following his jail term. During his probation, he is barred from publicly advocating the legalization of marijuana for medicinal purposes.