Many people assume chemical testing for THC is as simple and reliable as testing for blood alcohol content (BAC), but in reality it is much more complex.
Even in states that decriminalize medical or adult-use of cannabis, police can still arrest you for driving under the influence. That may not come as much of a surprise: most people know driving impaired is illegal, regardless of the substance. But many people don’t realize how difficult it is to chemically test for cannabis intoxication.
Here’s the answer to five big questions you might have about “weed DUI.”