According to the authors, when interviewing at the scene of a crime, an investigator must use if there is the slightest possibility that the suspect or accomplices are within hearing distance.

Absolute discretion

Explanation:

Absolute discretion is the desecration that is in a broad range. There are differences in court to a trustee exercise. The court does not substitute their judgment for those trustees. The trustee should not talk arbitrarily. Trustees should their judgment and faith in the favor of good knowledge and inquiry concerning the information. But in some cases, the trustee has to make some critical decisions.  

Thus when interviewing the science of crime an investigator should use absolute discretion.  

the atm that sounds like it should be the answer