Which of the following is considered improper behavior on the part of an investigator who is interrogating a suspect? a. obtaining an admission of guilt. b. causing duress to the suspect. c. obtaining information for use by prosecutors. d. determining the suspect's method of operation.

If im correct, it would be B.

Explanation:

Most investigators actually hope that guilt is what breaks their suspect so that they can get a confession or get what answers it is that they need, they are always of course obliged to obtain information for use by prosecutors, and determining suspect's methods of operation helps get more into a suspect's mind

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