Which of the following codes indicates the presence of subjects or suspects?

The code that indicates the presence of subjects or suspects is 10-15. In law enforcement communication, specific codes are designated to convey critical information succinctly. 10-15 is specifically employed to notify officers that there are suspects in the area or that a suspect has been apprehended. This allows for clear and efficient communication among personnel regarding potential threats or ongoing investigations, which is vital for officer safety and operational readiness.

The other codes referenced do not pertain to the presence of subjects or suspects. For example, 10-12 is used to indicate that visitors are present, which does not relate to suspects or dangerous individuals. 10-11 generally refers to "dog case" or animals, and 10-20 is used for location requests, neither of which conveys information about human subjects or suspects. Understanding these distinctions ensures that officers can communicate effectively in various situations.