You must provide a safe working environment for all of your employees. Employees who can concentrate on their jobs without constant fear of injury will be more productive and less inclined to complain to the California Division of Occupational Safety and Health, better known as Cal/OSHA.
Federal and state laws require you to reasonably protect your employees from work-related illness and injuries and workplace violence.
Safety in the workplace is a very serious topic. You're up against inspections, citations and compliance schedules. Although there is an appeals process, maintaining a safe workplace is your best defense.