Actually, no, there aren’t. As of this moment, there’s no way to know if you’re intoxicated by marijuana, and, since that’s legal in a number of US states, that’s a ‘problem’. (Although, let’s be real, stoned people tend to drive reeeeeeaaaaaalllllllllly slowly, not exactly hugely dangerous.) You can detect the metabolites with a urine or blood test, but that doesn’t tell you how long ago you used it, or if you’re still under the influence.
Actually, no, there aren’t. As of this moment, there’s no way to know if you’re intoxicated by marijuana, and, since that’s legal in a number of US states, that’s a ‘problem’. (Although, let’s be real, stoned people tend to drive reeeeeeaaaaaalllllllllly slowly, not exactly hugely dangerous.) You can detect the metabolites with a urine or blood test, but that doesn’t tell you how long ago you used it, or if you’re still under the influence.