Close to two-thirds of the drivers who were killed in highway crashes and tested for drugs afterward had opioids, marijuana or some combination of the two in their bodies, according to a new report on driving drugged in the United States. That number is likely to increase as more states move to effectively legalize marijuana while struggling to find ways to detect its active use in motorists. With legislation to legalize recreational marijuana pending in 21 states, the new Governors Highway Safety Association report urges states to move faster toward developing reliable roadside testing devices and providing better training for law enforcement to detect drivers under the influence of such drugs.