Narcotics agents raided three marijuana grow sites in Madera County.
Agents were flown into the remote areas on Monday and ripped out more than 22,000 plants growing at three sites near North Fork.
No arrests were made at the sites.
Madera County Sheriff John Anderson says these operations are near some of the most popular destinations for fishermen, hikers and campers and believes the sites are the work of Mexican drug cartels.
Sheriff Anderson says the growing operations threaten the land with pollution and soil erosion.
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