A. For the purpose of this chapter, the words “security patrol service” and “security patrol system” shall be deemed to be any service or system which purports to furnish or does furnish to members or subscribers for a consideration, or otherwise, any watchman or guard, either uniformed or otherwise, to patrol any district in the city, or to guard or watch any property, or to perform any service usually and customarily performed by the regular patrolmen of the police department of the city. “Security patrol services” and “security patrol systems” also includes the performance by any person on guard duty at a public function, while wearing a type of uniform which would indicate that such person is a peace officer.

B. “Security patrol service” and “security patrol system” shall not include any individual that has only one employer and who is employed to watch, guard or protect only the premises, property or person of that employer, or a common carrier engaged in interstate commerce, or an individual employed by such carrier to watch, guard or protect the premises, property or persons traveling on or for such carrier.