What qualifies as a "peace officer" under Missouri law?

In Missouri, a "peace officer" is specifically defined as an individual who holds a valid peace officer license issued by the state. This license ensures that the individual has undergone the required training and meets certain qualifications and standards set forth by the Missouri Peace Officer Standards and Training (POST). Holding this license is crucial, as it signifies the officer's ability to perform law enforcement duties legally and competently.

The other options do not fully encompass the legal definition of a peace officer in Missouri. For example, simply carrying a firearm does not confer peace officer status, as there are many individuals who can carry firearms but do not have the necessary police training or licensing. Being actively involved in the justice system or volunteering in law enforcement does not automatically qualify someone as a peace officer either, as these roles may not require a peace officer license. Thus, the correct answer highlights the significance of the official licensure process which is essential for peace officers in Missouri.