Drugs, Inc. 4

San Francisco Meth Zombies (2013)

San Francisco, Calif. — the epicenter of the 1960s' psychedelic revolution — is notorious for drugs. But in the new millennium, the city, especially the gay community, is struggling to recover from a meth epidemic. The enabler of this situation is the Asian cartel, which has been poisoning San Francisco with high quality meth for almost 25 years — but the Mexican cartels are intent on taking over. Nat Geo goes inside one of the worst drug ghettos in America — the heart of the drug trade.

Jamaican Gangs, Guns and Ganja (2013)

Kingston is in the hands of highly organized and warring drug gangs. They manage drug trafficking and distribution at all levels. With the patronage of politicians, they fight hard to protect their turf in a city where poverty and guns drive the drug trade.

Windy City High (2013)

Chicago, the biggest open-air crack and heroin market in America is at saturation point. The result: record levels of overdoses and homicides, as gangs fight over drug turf.

High in Houston (2013)

Houston's drug hub is the 'Bloody Nickel' - the Fifth Ward. Five square miles of 24/7 drug and party action. Gangs work across the ethnic divide to keep the drugs flowing; while cops and Cartels vie with each other for control.

Rocky Mountain High (2013)

Denver - the mile high city - has just legalized recreational use of Marijuana. The city's gang-banger dealers have battled falling profits since medical Marijuana became law, and forced them to push new products. This latest move is last straw.