BOSTON (AP) — The state’s largest teachers union says students should be able to opt out of high-stakes assessment tests.

Delegates to the Massachusetts Teachers Association’s annual meeting this weekend voted to send a letter to Education Commissioner Mitchell Chester and state lawmakers urging them to give parents the choice to take their public school students out of standardized tests.

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The union says no student should be penalized for refusing an assessment test and that students who opt out should not be included in data used by state or federal agencies to determine a school’s success or failure.

The MTA — which says it want to a stop to what it calls the “madness of standardized testing” — says school districts should provide parents with information explaining their right to refuse the tests.

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