Extra teacher recommendation?

<p>On the WashU admission FAQ, it says:
"Washington University requires information from the high school guidance counselor and one Teacher Evaluation from an academic teacher in high school with whom the student has taken a course. Extra letters are not required, but if you would like to submit additional letters, you are welcome to do so. For example, sometimes students choose to submit an extra letter of recommendation from a coach, an employer, or a member of the clergy because that person can provide unique insights that teachers may not include."</p>

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<p>washu's response gives me the impression that any extra letters of recommendation should be from an outside-of-school source (not a teacher). Is it ok to send a 2nd teacher recommendation? Will they read it?</p>