Four days after a 15-year-old with a disability was mistakenly detained and handcuffed by immigration agents outside of Arleta High School, the first day of the new school year in the Los Angeles Unified School District seemed normal. Students at Arleta High walked through the school’s annual red carpet on Thursday as music played and cheerleaders performed. One is the family of an 18-year-old Reseda High School student who was detained while walking his dog and is currently in a detention center in Los Angeles. … Can we spare, beyond politics, policy and legalities, can we spare our children from that trauma?”At schoolPatin, the Arleta High School teacher, said attendance remained strong on her campus and in her classrooms. But we’re especially vigilant now.”And while the overall energy was positive, she said the immigration raids have impacted students.