Who is a a police officer?

A police officer is any person who is authorized by a governmental entity or private entity specifically authorized by law (e.g., Amtrak and other railroads) to employ police officers. Most officers are required to complete training prescribed by a statewide standards organization (such as a Peace Officers Standards and Training Commission), meet certain physical, mental, and emotional standards, and take an oath of office. Police officers may be employed by their agency or volunteer, as in the case of auxiliary or reserve officers. In many states, part-time reserve or auxiliary officers have no police authority when off duty.