def rejects_questionnaire_from(self, participant):
if participant.status != "<STR_LIT>":<EOL><INDENT>return (<EOL>"<STR_LIT>"<EOL>"<STR_LIT>"<EOL>)<EOL><DEDENT>
Mechanical Turk participants submit their HITs on the MTurk site
        (see external_submission_url), and MTurk then sends a notification
        to Dallinger which is used to mark the assignment completed.

        If a HIT has already been submitted, it's too late to submit the
        questionnaire.