"Now, you can order medical marijuana and a Sidecar will deliver it to your door," the San Francisco-based startup whose list of backers includes British tycoon Sir Richard Branson said in a blog post.
Early this year, Sidecar began delivering flowers, groceries, hot food and other items in its hometown as it began expanding the same-day service to other US cities.
At the time, Sidecar co-founder Sunil Paul said that he expected same-day delivery services to represent half the company's business by the end of this year.
Half of Sidecar trips in San Francisco now involve deliveries, according to the company.
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Sidecar teamed with Meadow, which runs a website where people can order medical marijuana from licensed dispensaries.
Orders are secured in lock boxes for trips, and drivers are card-holding medical marijuana patients who are also members of local collectives shipping the pot, according to Sidecar.
Deliveries are promised within an hour of ordering.