If you can show the County Health Department that the employees are cheating on the food handler's card test, then the department may invalidate their cards, and the result would be that none of the employees can work until the take a new test. Also, by making a report to law enforcement, you would be protected from losing your job under the state whistleblower laws. See this link for a list of county health boards.
Re your coworkers harassment, if you believe that any of this is related to your race, color, nationality, religion, ancestry, sex, sexual orientation, pregnancy, age or disability, then you can file a complaint with the Department of Fair Employment and Housing.
If the harassment is based on some bias unrelated to unlawful discrimination as above described, then you cannot file a complaint.
Hope this helps.
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