Vermont Governor Phil Scott, a Republican, said on Wednesday he was vetoing a bill to legalize marijuana, and sending it back to the legislature for changes."We must get this right," Scott said in prepared remarks at a press conference today. "I think we need to move a little bit slower."Though he said he views the issue "through a libertarian lens," Scott vetoed the bill due to concerns about detecting and penalizing impaired drivers, protecting children, and the role and makeup of a Marijuana Regulatory Commission.The governor said he is "not philosophically opposed" to legalization, "and I recognize there is a clear societal shift in that direction." He said he'll send recommended changes to the the Democratic-majority legislature, and that if they address his concerns, "there is a path forward on this issue."One point that the governor wants the commission to tackle is establishing "how impaired is too impaired," according to Rebecca Kelley, the governor's communications director, as well as exploring what devices might be effective in detecting that impairment. But as NPR's Tovia Smith has reported, police "do not yet have reliable roadside toxicology tests that can say for sure if someone's too high to drive in the way a breathalyzer or blood test can show if someone's too drunk."Despite the illegality of its recreational use, the Vermont Department of Health found that the state has among the "highest prevalence of marijuana use" across all age groups, and the second highest of all states among those age 12 to 25. Recreational use of marijuana is currently legal in eight states and the District of Columbia.If Vermont's bill had not been vetoed, it would have been the first state to legalize recreational marijuana via a legislative body, not a public referendum. In November, California, Maine, Massachusetts, and Nevada voters legalized recreational pot; Arizona voters rejected it.According to the National Conference of State Legislatures, 19 states have bills pending that would legalize marijuana for adults; more than half of states allow medical use of marijuana.In Vermont, the bill's journey through the legislature shows the variety of approaches that states are considering. As Vermont Public Radio reports,