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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Criminal Sociology by Enrico Ferri: systematic collection of criminal evidence.
But, for the present, the most certain and profitable aids in the
collection of evidence are those afforded by the organic and
psychical characteristics of criminals. In my study on homicide I
reckoned up many psychological and psycho-pathological symptoms
which characterise the murderer, the homicidal madman, and the
homicide through passion. And in my professional practice I have
often found by experience that there is a great suggestive
efficacy in these psychological symptoms in regard to the conduct
of a criminal, before, during, and after a crime; and it is
important to bring this knowledge scientifically before detectives
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