What qualifies as a dangerous weapon according to protective security guidelines?

The definition of a dangerous weapon according to protective security guidelines centers around the potential harm it can inflict. Specifically, a dangerous weapon is characterized as any item—be it a weapon, device, or substance—that has the capability to cause serious bodily injury. This broad definition ensures that a wide array of potential threats is encompassed, including firearms, knives, explosives, or harmful chemicals, which could all lead to significant harm or mortality.

Knowing this, the other options do not fit the criteria for what is considered a dangerous weapon. The pocket knife mentioned, while it may be sharp, is categorized as less dangerous in the context provided due to its size. Similarly, a firearm used for recreational purposes, though dangerous, does not meet the criteria without context on its usage. Finally, a device that cannot cause injury clearly does not qualify as a dangerous weapon, as it lacks the essential characteristic of the ability to inflict harm.