The Tamalpais Union High School District mishandled an investigation into alleged antisemitic speech by a teacher, state officials said. The California Department of Education said the district should have indicated there was unlawful discrimination under the state education code. The department issued its decision on Friday in response to an appeal by a parent. The investigation involved remarks a Spanish teacher at Redwood High School allegedly made on Oct. 11 during the Jewish holiday season, specifically during the observance of Rosh Hashana, the Jewish new year. “Isn’t it weird that we have a day off for a Jewish holiday and...