PIERRE, S.D. (AP) — South Dakotans will vote this year on whether to legalize recreational marijuana for adults 21 years and older. Secretary of State Steve Barnett said Monday his office has validated a proposed constitutional amendment that would legalize marijuana for adults 21 and older and require the state Legislature to enact a hemp cultivation law. Barnett says his office found the petition had enough valid signatures to put the proposal on the Nov. 3 ballot. South Dakota voters in November also will decide a measure to allow medical marijuana for patients with serious health conditions.