What must be true for private officers carrying weapons?

In the context of private security officers carrying weapons, it's crucial to understand that they are often required to demonstrate proficiency and competence with the specific weapons they carry. This means that they must have qualified with a particular firearm or weapon to ensure they can handle it safely and effectively. The requirement to carry only the weapon with which they last qualified serves to uphold safety standards and ensure that officers are using weapons they are trained on. This is vital for the responsible exercise of their security duties, as it minimizes the risk associated with unqualified weapon use.

The other options present suggestions that do not align with standard regulations governing armed private security personnel. Allowing officers to carry any weapon without restrictions, for instance, could lead to dangerous scenarios, as not all weapons are suitable for private security situations and each weapon requires specific training and qualifications. Similarly, mandates about clothing or carrying unqualified weapons do not contribute to the professionalism and level of preparedness expected from security personnel. Thus, maintaining strict qualification requirements helps to establish a professional and responsible security environment.