An employer can discipline an employee for any reason it wishes, unless it expressly violates the employer's own disciplinary policy, or represents unlawful discrimination based on race, color, nationality, ancestry, religion, sex, sexual orientation, pregnancy, age or disaiblity.
This may seem unfair, but it's legal, because under Cal. Labor Code 2922, the employer is entitled to terminate an employee "at will" -- at any time, for any reason, or for no reason at all. The result of this law is that an employer doesn't actually need to discipline the employee at all. The employer can state no reason whatsoever for its actions, and there is nothing that the employee can do about it (absent the previously-described exceptions).
Please understand that I "justanswer" questions "about" the law. I have no interest in providing you with anything less than a completely satisfying answer. However, if the law does not favor your unique circumstances, then the best that I can do is to explain what the law "is" and what it "is not."
Hope this helps.
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