The story

Beyond the towering trees that have stood here for thousands of years, an intense drug war is being waged.

Illegal immigrants connected to Mexico's drug cartels are growing hundreds of millions of dollars worth of marijuana in the heart of one of America's national treasures, authorities say. It's a booming business that, federal officials say, feeds Mexico's most violent drug traffickers.

"These aren't Cheech and Chong plants," said John Walters, director of the National Drug Control Policy. "People who farm now are not doing this for laughs, despite the fact Hollywood still thinks that. They're doing it to make a lot of money."

Walters spoke from a "marijuana garden" tucked deep into the Sequoia National Forest, a two- to four-hour hike from the nearest road, far removed from the giant sequoias the region is best known for. Watch Hollywood needs to chill out, get serious about pot

Ten thousand marijuana plants, some 5 feet tall, dotted the mountainside's steep terrain amid thick brush, often near streams. This garden's street value is an estimated $40 million, authorities said. Read full article »

CNN's Wayne Drash contributed to this report from Atlanta.

All About National Park ServiceMarijuanaMexico

American Morning
Get the most news in the morning with John Roberts and Kiran Chetry.
Weekdays, 6 a.m. ET

Don't Miss