Crime Classification Manual Part II Chapter 9 A 39
Crime Classification Manual Part II Chapter 9 A 39
A STANDARD SYSTEM FOR INVESTIGATING AND
CLASSIFYING VIOLENT CRIMES SECOND EDITION
Some
offenders use prerecorded tape messages over the telephone, and the calls may
be made locally, long distance, or collect. Other investigative considerations
include possible background noises, foreign accents, local dialects, and a
consideration of specific calling patterns.

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