In police codes, which of the following means that an officer is no longer on duty?

In police codes, "10-7" is used to signify that an officer is no longer on duty. This code is part of the ten-codes system, which provides a concise and standardized way for law enforcement personnel to communicate various situations over the radio.

When an officer transmits a "10-7," it indicates to dispatch and other officers that they have completed their shift or are otherwise unavailable for calls and are effectively off-duty. Understanding this code is crucial for ensuring that communication within law enforcement is clear and that all personnel are aware of each other's availability for responding to incidents.

The other options refer to different statuses or situations: "10-6" usually indicates that an officer is busy but available for calls, "10-5" relates to a request for relay or information, and "10-3" typically indicates that the officer wants everyone to stop transmitting. Each of these codes serves a unique purpose in police communication but does not signify that an officer is off duty.