A company in the San Francisco area is delivering bitcoin-purchased medicinal cannabis to customers via drone.

Trees, which claims to sell the "highest quality" medicinal cannabis to people holding a medical recommendation, accepts payments in bitcoin alongside traditional payment methods such as cash, online bank transfer and credit cards.

The service requires users to provide their driving and medical license when ordering. To get medical approval, consumers must have a short evaluation with a doctor, either online or at a clinic.

Users must give the medical reason for their use of cannabis, declare any pre-existing health conditions, confirm whether they've used cannabis before and state their preferred method of ingestion.

Customers can then choose from six different cannabis boxes, ranging in price from $59 to $149, all of which come with a certificate of authenticity.

Currently, Trees only delivers to the San Francisco Bay area.

Although its delivery method is...