PORTLAND, Ore. — Portland Public Schools is discriminating against students in special education by loading them onto school buses five to 15 minutes before school ends and costing them hours of classroom time over the course of an academic year, according to a federal civil rights complaint now under review.  The filing comes months after the nearby Beaverton School District faced a similar complaint and changed its policies.  “I was shocked that it is still going on. I figured that once it became known what happened with Beaverton, other districts would follow suit and correct their discriminatory behavior,” attorney Diane Wiscarson, who filed both complaints, told The Oregonian/OregonLive. “It’s not like it is gray and you could see it one way and I could see it another way. It’s discriminatory and it’s not allowed.”