SAMMAMISH, Wash. - A sixth grader sprayed nonpoisonous dog repellent on a cookie intended for her teacher and has been expelled, officials say. The situation developed when the pupil brought some store-bought chocolate chip cookies to school Monday for a party at Elizabeth Blackwell Elementary School in this suburb east of Seattle, Lake Washington School District spokesman Peter Daniels said.She handed one cookie to her teacher, who took a bite. About half a dozen other students bit into cookies that apparently had been hit with overspray and -- like the teacher -- coughed at the bitter taste and strong odor...