As California’s cultural acceptance of marijuana relaxes in western Nevada County where plenty of people grow the drug, schools are having a harder time convincing students to stay sober in class. “How do you convince them there is something wrong with them when everyone in their family is doing it?” asked Linda Grotke, who runs the local high school district’s STudent Assistance Resources & Services (STARS), which includes a drug diversion program. “All they know is all the money that goes into that household is coming from that drug,” Grotke said. During the 2010-11 school year, 133 of the district’s …