What do effective interview techniques explore about a subject?

Effective interview techniques primarily focus on exploring a subject's mental and physical integrity because this aspect is crucial in assessing the individual's overall wellbeing and reliability during the interview process. Understanding a subject's mental state can help interviewers gauge their ability to provide accurate information, while physical integrity can be relevant when determining their fitness for certain activities or processes, such as legal proceedings or immigration status.

Mental and physical integrity also encompass broader themes like stress responses and the ability to cope under pressure, which are important indicators of how a subject may react during questioning. By assessing these elements, interviewers can develop a clearer and more comprehensive picture of the person's situation and intentions.

The other aspects mentioned, such as family history, employment status, and personal opinions, may be relevant in specific contexts but do not directly align with the fundamental goal of ensuring the subject's overall mental and physical integrity during the interview process. These aspects may be explored as part of broader inquiries but are not the main focus of effective interview techniques.