. >> montgomery: mendocino county sheriff tom allman has been walking a tightrope with marijuana growers for years. then came medical marijuana, and increasing confusion about what's legal and what's not. >> we're trying to remove the gray area. we are trying to make it black and white. and if we can remove the gray, if we can remove the inconsistencies, if we can have people not confused about the marijuana laws, then i have succeeded. >> montgomery: how do you keep track of what matt is growing here? when we first began filming last fall, only about 20 growers had signed up for the tagging program, generating a few hundred thousand dollars in fees for the cash-strapped county. >> the cannabis is grown in mendocino county through the local regulation ordinance here. >> montgomery: but cohen, like other growers in the program, has a problem-- getting his product to his customers. >> basically, i'm the boss, and i've got to make this run because our two guys got nailed two days in a row last week. so i'm making the run. >> montgomery: two of cohen's delivery men were pulled over at random