In what scenario should clothing be left on a casualty?

In a chemical environment, clothing should be left on a casualty because it can provide a layer of protection against hazardous agents. Clothing may act as a barrier, preventing direct contact between the skin and harmful substances. Removing clothing in this scenario could increase the casualty's exposure to dangerous chemicals, leading to further injury or complications.

Other scenarios listed, such as comfort or the casualty being unconscious, may not always warrant leaving clothing on. For instance, in cases of unconsciousness, if the clothing poses a risk to airway management or if it is contaminated, it may need to be removed. Similarly, when symptoms are severe, the priority may shift to assessing and treating immediate life-threatening conditions, which may involve the removal of clothing to access the injuries or administer aid efficiently. Thus, in a chemical environment, preserving clothing serves an essential protective function.