California Employment Law
Have California Employment Law Questions? Ask a Lawyer.
It depends what you mean by blackball. Employers are free to state their opinions about an employee's performance along with any factually true statements (i.e. stating the number of times an employee was late to work) to prospective employers who call for a reference. Employers cannot, however, make knowingly false statements (i.e. lie and say that an employee was fired for stealing) in order to blackball someone from getting hired. Again, please feel free to let me know if you have any further concerns.