What must officers have in addition to a report of someone carrying a firearm to establish reasonable suspicion?

The requirement for officers to have a 'plus factor' indicating unlawful possession is essential for establishing reasonable suspicion in the context of someone carrying a firearm. Reasonable suspicion refers to the belief that a law enforcement officer has, based on specific and articulable facts, that a person is involved in criminal activity. Simply having a report of someone carrying a firearm is not sufficient on its own; there must be additional indicators that suggest the manner in which the firearm is carried may be illegal or threatening.

A 'plus factor' can encompass various behaviors or circumstances surrounding the individual carrying the firearm, such as their actions, demeanor, or any relevant context that raises suspicion about the legality of possessing the firearm. This could include the individual acting suspiciously or in a manner that aligns with criminal behavior, which helps justify the officer's further investigation or inquiry.

In contrast, while eyewitness testimony or surveillance video can provide supporting evidence, they are not necessary components to establish reasonable suspicion. The history of violent behavior, although potentially relevant, does not directly relate to the legality of the current situation either. Therefore, having that 'plus factor' is critical to moving from mere observation to a justified investigative action.