By ROBERT TANNER, THE ASSOCIATED PRESS Every school has rules governing teacher behavior. Every state has laws against child abuse, and many specifically outlaw teachers' taking sexual liberties with students. Every district has administrators who watch out for sexual misconduct by teachers.

EDITOR'S NOTE - In the final installment of a three-day series on sexual misconduct by teachers in America's schools, the AP examines how a lack of decisive intervention in schools and legislatures allows abusers to keep operating.

By ROBERT TANNER Every school has rules governing teacher behavior. Every state has laws against child abuse, and many specifically outlaw teachers taking sexual liberties with students. Every district has administrators who watch out for sexual misconduct by teachers.