AAA Study Finds No Scientific Basis for Drugged Driving Laws Based on THC Levels
 

The American Automobile Association recommends states abandon such laws in favor of testing for actual impairment.

Legal blood limits for marijuana are not an accurate way to measure whether someone was driving while impaired, and can lead to unsafe drivers going free while others are wrongfully convicted, according to a new study.

The study released Tuesday by the AAA Foundation for Traffic Safety found that drivers can have a low level of THC, the active ingredient in marijuana, in their blood and be unsafe behind the wheel, while others with relatively high levels may not be a hazard.

Marijuana is not metabolized in the system in the same way as alcohol. So while a person with a blood-alcohol level of .08 or higher is considered too drunk to drive, it's not possible to say the same thing absent other evidence about a person testing at 5 nanograms per milliliter of blood of THC ? the level used to find impairment by Colorado, Montana and Washington, the study found.

Continued AAA Study Finds No Scientific Basis for Drugged Driving Laws Based on THC Levels | Alternet

There is no reason for anyone with any amount of alcohol or marijuana in their system to be driving at all. I would personally prefer a zero tolerance instead of all these bullshit guidelines to manage it for small amounts. Just my opinion.

There is a slippery road with pot. You can smoke it then 10 hours later be 100% sober and fine, but still have a high level in your blood. It can actually stay in your system for up to 30 days and beyond after you smoke it.

I think checking for impairment would work better, but I have zero tolerance for anyone driving under the influence of anything and I think the punishment for doing so should be very severe.

Zero tolerance is a bad idea. Driving by people smoking up? Now you've got some in your system.

You would need to hot box a room and basically breathe in enough secondhand smoke on purpose to fail the test:

Second-Hand Pot Smoke Gets You High, Without Ventilation

Agreed...