roadside sobriety test In random roadside testing, more than 22% of drivers showed evidence of drug use, according to NHTSA data. (Photo: Shutterstock)

U.S. transportation safety officials are sounding the alarm on drug-impaired driving, calling for state and federal regulators to do more to tackle the growing problem as states grapple with prescription drug abuse and adopt a more permissive stance on marijuana.

The National Transportation Safety Board (NTSB) on Tuesday called on the National Highway Traffic Safety Administration (NHTSA) to write standards for devices allowing police to test drivers for drugs on the roadside and to give states additional guidance on how to combat drug-impaired driving.

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