Are you high? The science of testing for marijuana impairment still evolving

There was a time when marijuana was illegal everywhere and testing for it was as easy as could be.

It didn’t matter the level of cannabinoids found in a person’s body. If it was there, they were breaking the law.

It’s different now.

The tests have changed from depositing a urine sample into a cup to drawing blood or offering oral fluids. Also different is the particular type of cannabinoid — the chemical compound that reacts in the brain — detected by any of those tests.

The evolving science of testing for marijuana, and the lack of consensus over how to measure impairment, is a…

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