Attempt to locate messages may be sent after which determination?

The correct choice is based on the procedural guidelines that govern attempts to communicate with individuals involved in ongoing investigations. When it is determined that the complainant has made every effort to contact the persons in question, it suggests that all available local avenues of communication have been exhausted. This acknowledgment is crucial because it establishes a legitimate reason for law enforcement to intervene and send locate messages. By confirming that the complainant has done their due diligence, officers can proceed ethically and effectively in an attempt to locate individuals who are crucial to the case.

In law enforcement protocols, it is important to have a clear basis for contacting individuals, ensuring that all proper channels have been followed. This step helps to protect the integrity of the investigation and ensures that actions taken are justified and warranted, which is essential in maintaining proper legal and ethical standards. Therefore, this determination provides the necessary foundation for initiating further communication efforts through messages that seek to locate individuals involved in the case.