In order to adequately protect people and property, security guards must know and enforce rules and regulations to prevent criminal activity before it happens. They may monitor points of access in a building or property to allow entry only to individuals with the correct identification or authorization. In some situations, such as public events or crowded areas, they walk amongst visitors to promote order and provide a visible presence that deters safety issues.
If working after hours, they may maintain surveillance of a property by patrolling the grounds or using closed-circuit monitoring or alarm systems. They’ll investigate and report signs of damage or unlawful entry as it occurs. Such issues require that they contact authorities and make written or verbal reports to law enforcement. In emergency situations, they may provide first aid or assistance and alert first responders.