Marijuana Mayhem (S06E05)

The rapidly growing appetite for California Sour Diesel, a potent strain of marijuana said to induce an instant high, is helping fuel a violent drug underworld that stretches from coast to coast. Legal dispensaries are getting robbed by criminals looking to resell product. Even legal growers are tempted by the profits of the black market. Nat Geo Channel gets an inside look at the marijuana trade, joining law enforcement as they pursue an illegal grow and following a frequent trafficker in a risky smuggling journey across the country. (National Geographic)