Senator Feinstein’s concerns about the secondary impacts of marijuana on public safety, as reported in The Fresno Bee article by the Associated Press’ Kevin Freking, echo the concerns of law enforcement. The threat of people driving while impaired, whether under the influence of alcohol and/or other controlled substances including marijuana, is real. But currently there is no way to measure how marijuana is impairing drivers the way that alcohol can be measured and standardized. Until the science catches up, should recreational use go forward?