Which of the following is an example of engineering controls in a trauma scene?

Locking out electrical energy sources is an example of engineering controls in a trauma scene because it involves implementing physical interventions to eliminate hazards. Engineering controls are designed to remove the risk of exposure to a potential danger, thereby protecting workers and bystanders in a trauma or crime scene environment.

In this context, locking out electrical energy sources ensures that any electrical systems are disabled, reducing the risk of electrical shock or other accidents that could occur due to equipment malfunction or unintended operation. This proactive measure is essential in maintaining safety conditions at a scene where there may be chaos and potential hazards that increase risks for responders.

Other options such as training staff, scheduling shifts, and providing emotional support are important aspects of workplace safety and management but fall into administrative controls or support systems. These are geared towards managing personnel and providing necessary skills or psychological support rather than directly addressing environmental hazards through physical means.