Existing law defines an assault as an unlawful attempt, coupled with present ability, to commit a violent injury on the person of another. Existing law defines a battery as any willful and unlawful use of force or violence upon the person of another. Under existing law, an assault or battery committed against a physician or nurse engaged in rendering emergency medical care outside a hospital, clinic, or other health care facility is punishable by imprisonment in a county jail not exceeding one year, by a fine not exceeding $2,000, or by both that fine and imprisonment. This bill would also make an assault or battery committed against a physician, nurse, or other health care worker of a hospital engaged in providing services within the emergency department punishable by imprisonment in a county jail not exceeding one year, by a fine not exceeding $2,000, or by both that fine and imprisonment. The bill would authorize a health facility that maintains and operates an emergency department to post a notice in the emergency department stating that an assault or battery against staff is a crime, and may result in a criminal conviction, as provided. By expanding the scope of a crime, this bill would impose a state-mandated local program. The California Constitution requires the state to reimburse local agencies and school districts for certain costs mandated by the state. Statutory provisions establish procedures for making that reimbursement. This bill would provide that no reimbursement is required by this act for a specified reason.