Welcome back to Higher Law, our weekly briefing on all things cannabis. I’m Cheryl Miller, reporting for Law.com from Sacramento. A little more than an hour’s drive west from here, Oakland-based Hound Labs recently unveiled its latest invention, a marijuana breathalyzer.

Hound Labs CEO Mike Lynn told NPR the device can accurately detect whether someone has smoked pot in the last two hours. Has an answer to the perplexing questions about marijuana impairment finally been found via this pot breathalyzer? Maybe not.