Racist graffiti found in a Missouri high school's bathrooms was the product of a "hate hoax," the school district announced Tuesday. When faculty at Parkway Central High School in St. Louis County announced that racist graffiti had been uncovered earlier in September, students and community members across the district staged a walkout in condemnation of the incident. However, the culprit behind the graffiti was a nonwhite student, according to a letter sent to parents, Supt. Keith Marty announced Tuesday. "The student responsible is not white," Marty wrote. "This does not diminish the hurt it caused or the negative impact it...