Preventive measures are also taken by the employees, and especially by the security staff, who — as some of us may not know — not only protect the property, but also indirectly contribute to the elimination of danger which may threaten, for example, children who would like to “explore” the site unnoticed, unknowingly exposing themselves to great danger OHS and subcontractors In preliminary qualification with respect to, among others, compliance with occupational health and safety (OHS) standards.