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AAA: Driver pot test shown to be invalid

From the Rutland Herald:

A report recently released by the American Automobile Association backs up what Vermont lawmakers heard during the debate over legalizing marijuana: There is no scientific way to prove if someone is under the influence of the drug while driving.

The AAA report looked at the states of Colorado, Washington and Montana, which all have thresholds in place for how much THC can be in someone’s system before they are considered to be under the influence. Those states established a threshold of five nanograms of THC per milliliter of blood.

The report argues that the five nanograms threshold doesn’t work. After looking into the cases of drivers who were pulled over for DUI and had THC in their systems, AAA says a substantial number of those arrested would be misclassified as impaired and those who are actually impaired would not have been flagged by the test for THC.

The report looked into having thresholds from one nanogram to 10 nanograms of THC per milliliter, but it found no level of THC that would back up what police see while conducting field sobriety tests.

Those who frequently use marijuana can show high levels of THC despite not being impaired while occasional users will have the THC leave their system quickly, according to the report.

The report was put together by the Center for Forensic Science Research and Education in Willow Grove, Pennsylvania. That lab also gave the state the same results about not being able to scientifically prove someone is stoned when the state commissioned its own study last year.