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Yellow dragon disease, which is also called citrus greening, has been found in southeast Florida and appears to be spreading, agricultural authorities say.

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Rolling Stone's State-by-State Guide to Weed in America

Are there dispensaries on every block or could smoking a joint land you in jail?

So far, the way that some states have tried to account for drug impaired driving is by creating what are known as "per se" laws – laws which designate a threshold of what level of THC is allowed in a driver's system in order to legally drive, as measured through bodily fluids. But the trouble with per se laws is that the levels detected in blood or saliva may not necessarily detect impairment; they simply note THC's presence in the body.

THC breathalyzers, on the other hand, could be the most reliable way to determine impairment and recent use. But while the technology for alcohol breathalyzers has been established for decades, it's not as simple as replicating the technology for THC detection because of the differences in how THC and alcohol are metabolized.

Marilyn Huestis is the recently retired chief of chemistry and drug metabolism at National Institute on Drug Abuse's Intramural Research Program. Her perspective on drug impairment is formed by 23 years of research on the effects of cannabis in human drug studies. In one of Huestis' controlled studies, they administered cannabis to occasional users and daily users, and found that in daily marijuana users THC could be detected in breath for up to four hours, and in other, less frequent cannabis users for up to two hours. "We found that if you found it in breath it definitely meant recent use. That's why it's valuable," says Huestis.

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Dear Ecouterre readers, We want to thank you for sharing this journey with us for the past eight years. Ecouterre.com broke ground in 2009 as the world"s first website dedicated to ethical and environmentally sustainable fashion. We helped to start the conversation about "eco fashion" when that term was fairly...

Dear Ecouterre readers, We want to thank you for sharing this journey with us for the past eight years. Ecouterre.com broke ground in 2009...