Sheriff's deputies arrested seven men running a large marijuana plantation today near Pyramid Lake in Ventura County. On public lands -- cleared, terraced and irrigated by tubes leading to a nearby creek — they found 130 pounds of drying marijuana. In Mendocino County, it's a different story. The Sheriff there is in a battle with federal agents of the Drug Enforcement Agency. They raided a marijuana farmer who had a Sheriff's permit and who was carefully complying with County Ordinance 931, designed to make it safe to grown medical marijuana under state law.