Workplace violence prevention is important for health care and social service workers. Workplace violence includes physical assaults, threats, harassment, and verbal abuse occurring at work. Risk factors include isolated work, low staffing, and presence of gangs or drug abusers. An effective prevention program has management commitment, a worksite analysis to identify risks, hazard controls like alarms and safe rooms, training on de-escalation, and recordkeeping to evaluate the program. The goal is a zero tolerance policy for violence to protect workers' safety and health.