If called for a potential disciplinary meeting, the faculty member should say,
“I believe this discussion could lead to my being disciplined. I therefore request that my union representative or officer be present to assist me at the meeting. I further request reasonable time to consult with my union representative regarding the subject and purpose of the meeting. Please consider this a continuing request; without representation, I shall not participate in the discussion.”
Then the faculty member should stop talking!
For background information, please see this web page: http://www.cueunion.org/general_info/weingarten.php