The cancer-killing properties of marijuana were the subject of discussion in a PBS documentary that aired this week to little media fanfare.

While using marijuana to kill cancer may sound like a wild claim to some, it struck Dr. Prakash Nagarkatti as a great idea. In his studies as professor of pathology and microbiology for the University of South Carolina, he tested synthetic cannabis drugs on cancer cells and developed a formula that was able to completely eradicate cancer cells in a test tube.

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A follow-up on mice afflicted with cancer found that up to 30 percent in the test group completely rejected their disease, while others had their tumors significantly reduced. The same drug is now being tested on humans with Leukemia.

But it’s not just Dr. Nagarkatti who sees the medical value of marijuana: it’s the whole pharmaceutical industry. And that’s another point the documentary makes, examining the patents various companies have filed, and what they claim marijuana-based drugs could one day be used to treat.

The video below is just an excerpt from the full documentary, which originally aired in Montana amid a debate about repealing that state’s medical marijuana law. The full, nearly hour-long film is available to watch online for free.

This video is from PBS.

Watch the full episode. See more PBS NewsHour.