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>> reporter: when the gardeners are inside the garden, this exclusive video shows how the marin gross protected their crop. a trip cord attached to soda cans to warrant illegal farmers of someone coming up the path. more than that, these kind of grow operations are armed camps. >> we are fining automatic weapons now regularly, ak-47s and m-4 full automatic machine guns and every grower is carrying side arms or shotguns slug over a shoulder. >> reporter: the growers aren't afraid to use them. there have been several instances of armed confrontations between growers and law enforcement...

>> security is an issue but we are establishing a high-end security facility here with infrared cameras, motion censors, on-staff guard. >> reporter: and dan rush of the united food and commercial workers union already representing 150 pot workers statewide couldn't be happier about the new businesses coming to town. >> you have some of the larger grows under contract already, we are figuring 300 to 400 jobs per larger grow and so we're looking at 1200, maybe 1500 jobs. >> reporter: it's estimated that marijuana could turn into a $14 billion a year business if it were fully legalized...