Marijuana grows openly in California towns

California's San Joaquin Valley is one of the most productive agricultural regions in the country. It is also where, among the fresh fruits and vegetables, an estimated half-a-million plants of marijuana are growing openly, some allegedly being sold for non-medicinal purposes.

"In the last two years, we've seen large-scale commercial farming operations of marijuana and explosions of backyard marijuana grows," said Lieutenant Rick Ko of the Fresno County Sheriff's Office. Ko says the spike in cannabis cultivation is a result of California's booming medical marijuana trade.

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