"Transportation may not be done by aircraft, watercraft, rail, drones, human-powered vehicles, or unmanned vehicles," according to the bureau's business licensing regulations. It adds: "Deliveries may be made only in person by enclosed motor vehicle. Cannabis goods may not be visible to the public during deliveries. Cannabis goods may not be left in an unattended motor vehicle unless the vehicle has an active alarm system. Vehicles used for delivery must have a dedicated, active GPS device that enables the dispensary to identify the geographic location of the vehicle during delivery."

California voted to legalize marijuana in November. And, by early next year, the state is expected to start dishing out licenses to thousands of businesses that intend to cultivate and sell pot. With projections placing the market for legal weed at $5 billion, it's no wonder that a number of startups are also trying to make some cash by transporting cannabis. As Ars Technica points out, the likes of MDelivers, Eaze, Trees Delivery have all promised to autonomously deliver your pot. Alas, it wasn't meant to be. But hey, at least you can still rely on drones for the Domino's hook-up after you pop to the dispensary.