SPOKANE, Wash. (AP) — The Spokane school district has released the findings of an investigation into an early May incident at a middle school when Black twin sisters were asked to clean cotton along with other students in a social studies class exploring the industrial revolution and the impact of the cotton gin. The eighth-grade students at Sacajawea Middle School said they were humiliated by the lesson. Their mother, Brandi Feazell, removed the girls from the school and went public with her complaint to Spokane Public Schools officials. The Spokesman-Review reported the third-party investigator the district hired, Onik’a Gilliam-Cathcart, determined that the teacher did not intend to harm the girls. But the school district acknowledged Friday that changes are necessary.