0% impaired? We know tired drivers are impaired. Should we require drivers to demonstrate 8hrs of sleep before operating a vehicle? What about people who do ok on less sleep? I think there are obvious issues with such a proposal and those issues transfer to THC usage. I would bet, if we could measure it, a large portion of fatal accidents would involve people who are not fully rested and had missed the 8hr target multiple times in the preceding week or two