Final answer:
The Occupational Health and Safety Act (OHSA) is the legislative act given the authority to investigate workplace incidents and accidents, enforced by the Occupational Safety and Health Administration (OSHA).
Step-by-step explanation:
The legislative act that has the authority to investigate workplace incidents and accidents is the Occupational Health and Safety Act (OHSA). The OHSA is designed to protect workers from health and safety hazards on the job, setting out the general health and safety regulations that workplaces must follow. Employers are required to inform employees about any potential hazards so they can perform their work safely. The act also establishes the Occupational Safety and Health Administration (OSHA), which is responsible for enforcing these standards, as well as providing safety training, keeping accurate records of work-related injuries and illnesses, and performing necessary workplace tests. Further, OSHA requires employers to provide personal protective equipment at no cost and to notify OSHA promptly following certain serious workplace incidents. This authority includes conducting inspections, issuing fines, and ensuring compliance with the established regulations. Workers also have rights under the OHSA to file complaints, receive training and hazard information, and participate in workplace inspections without fear of retaliation.