The employee organization recognized or certified as the exclusive representative shall represent all employees in the unit, fairly and impartially. A breach of this duty shall be deemed to have occurred if the employee organization’s conduct in representation is arbitrary, discriminatory, or in bad faith.
Source:
Section 99564.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PUC§ionNum=99564.5..