The cost of legal weed was palpable this week in north-central Florida, where a stoned motorist sideswiped a bus, killing eight Mexican farmworkers and injuring dozens more.
This is what billions in lobbying, marketing, and product development buy - more users and more addiction, said Kevin Sabet, president of the group Smart Approaches to Marijuana.
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A RAND Corporation study set shows that the growing availability of cheap medical cannabis is linked to a roughly 8 percent increase in use among those aged between 12 and 17.
The devices are essentially virtual reality headsets with eye-tracking sensors that measure tiny movements - an automated version of the tests cops already perform on suspect motorists.