Drugged driving deaths spike with legal marijuana, opioid abuse

A car passes by a marijuana dispensary in downtown Denver in 2012.

didn’t have a crash.

Driver drug testing varies from state to state. States don’t all test for the same drugs or use the same testing methods.

“A lot of the tools we developed for alcohol don’t work for drugs,” said Russ Martin, government relations director for the highway safety group. “We don’t have as clear a method for every officer to conduct roadside tests.”

Police who stop drivers they think are impaired typically use standard sobriety tests, such as asking the person to walk heel to toe and stand on one leg. That works well for alcohol testing, as does breathing into a breathalyzer, which measures the blood alcohol level.

But these standard sobriety tests don’t work for drugs, which can only be detected by testing blood, urine or saliva. Even then, finding the presence of a drug doesn’t necessarily mean the person is impaired.

With marijuana, for example, metabolites can stay in the body for weeks, long after impairment has ended, making it difficult to determine when the person used the drug.

States have dealt with drugged driving in different ways. In every state it is illegal to drive under the influence of drugs, but some have created zero tolerance laws for some drugs, whereas others have set certain limits for marijuana or some other drugs.