Which term specifically designates usage in law enforcement when referring to "OT"?

The correct term that specifically designates usage in law enforcement when referring to "OT" is "Overtime Officer." This term is commonly used to describe law enforcement personnel who are working additional hours beyond their regular schedule. In many police departments, officers are offered overtime opportunities to maintain public safety, manage events, or cover for personnel shortages. This is crucial for ensuring a sufficient number of officers are on duty to respond to incidents and maintain order in the community.

While other options may have various meanings in different contexts, they do not pertain to law enforcement or the common usage of "OT" in that field. Thus, understanding the context in which "OT" is used helps clarify its meaning as it relates specifically to additional working hours for officers.