SIOUX FALLS, S.D. (AP) — South Dakota Gov. Kristi Noem is under investigation for using a state-owned airplane to fly to political events and bring family members with her on trips. But the decision on whether to prosecute the Republican governor likely hinges on how a county prosecutor interprets an untested law that was passed by voters in 2006. State law allows the aircraft only to be used “in the conduct of state business.” But Noem attended events hosted by political organizations. State plane logs also show that Noem often had family members join her on in-state flights in 2019. It blurred the lines between official travel and attending family events, including her son’s prom and her daughter’s wedding.