Design Criticism of the Cognalyzer, a Wearable That's Like a Breathalyzer for Cannabis

If someone's drunk, you can measure their blood alcohol concentration with a breathalyzer. But there's been no equivalent for measuring how high on THC someone is. "In an era of cannabis legalization," writes industrial design firm Shape Products, "reliable impairment detection will become increasingly important for protecting consumer rights and safety in the workplace." By "consumer rights," they're presumably talking about a purchaser of cannabis; does this pot get me as high as it's...