Truth is, they really don't want K-12 teachers knowing that much. What they want is a marginally educated 'proctor' who merely administers course content that is developed elsewhere. This way, the 'teacher' cannot exercise discretionary decision-making vis-s-vis the individual student. They have no input in any of the course material.This is not teaching, its conditioning. Read: Pavlov's dog.
My stepson had huge problems with his 10th grade U.S. history teacher. When I had a conference with him, the guidance counselor, and the asst. principal, it became painfully apparent he had no clue about U.S. history. I wiped the floor with him. What was his degree in?
I cr@p you not.