Hound Labs, an Oakland-based maker of a breathalyzer that measures marijuana, announced Tuesday that it has raised $8.1 million in venture capital funding led by Benchmark (early investor in companies like Uber and Snap).
The problem: THC, the active ingredient in marijuana, can remain in a user's system for days (perhaps even weeks) after the period of impairment. That means traditional THC tests ― hair, urine, blood, etc. ― are less valuable in an era of increased legalization. What's key is knowing if someone is driving high, or comes to work high.