The Seattle NAACP announced its support of teachers boycotting the Measure of Academic Progress (MAP) test on Monday.
Teachers are boycotting the MAP test because they believe it's a waste of resources and instructional time.
The NAACP said the test does not reflect what students have learned in the classroom and could produce inequitable results when used for to select students Advanced Placement classes.
The boycott started at Garfield High School in early January, but support has grown regionally and nationally, thanks to an online petition.
Seattle Schools Superintendent Jose Banda said if teachers do not give students the test, they could face a 10-day, unpaid suspension.
This isn't the first time teachers have boycotted standardized testing. In 2009, a middle school teacher and two elementary school special education teachers were suspended for not administering the Washington Assessment of Student Learning (WASL).