Final answer:
The optimal time for an officer to implement the mirroring technique is throughout the entire interview, using it subtly to establish rapport and encourage a relaxed conversation.
Step-by-step explanation:
The best time for an officer to use the mirroring technique during an interview is throughout the entire interview. Mirroring involves copying the body language, speech patterns, or attitudes of the person being interviewed to build rapport and encourage openness. The use of this technique can help to create a more relaxed conversation that feels less like an interrogation and more like a mutual exchange of information. It's important to apply this technique in a subtle manner to avoid seeming insincere or mimicking.