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25 Cards in this Set

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Criminal investigation

The reconstruction of a violation of criminal law in order to identify and locate the perpetrator and gather evidence for trial

Step one

Record time the call was received, you time of arrival, and weather condition

Preliminary investigation

Step two

Find out if anyone is injured , what happened, who is the suspect, where did they go and who is the victim

PI

Step three

Give aid to anyone injured

Step four

Conduct a protective sweep

Step five

Protect the scene and call for necessary assistance

Step six

Locate and identify witnesses

Step seven

Broadcast any lookouts or necessary information

Step eight

When the requested assistance arrives, secure the scene more adequately

Step nine

Walk through: locate potential evidence, to establish a path that is safe to walk through, to mentally trace the events of the crime

Step ten

Photograph, measure, and sketch the scene

Step eleven

Collect, label, and package evidence

Step twelve

If necessary, secure the scene until some follow up investigation is done

Scene protection

To prevent the destruction of evidence and to allow for an accurate reconstruction of the events occurring at the scene

Boundaries

Place of arrival, point of entry, part through scene, contact with scene, contact with victim, place of exit, place of arrest

Statement

A first hand account of a crime as given to an investigating law enforcement officer

Sources of statements

Witnesses


Victims


Suspects

Parts of statement

Body- narrative (individual tell story) question and answer (interviewer able to control the interview)


Allow person to tell facts in the order they recall them


Use words within subject's vocabulary


Closing - where statement was taken, investigators that took the statement , if written statement then the individual signature should be collected

Reconstruction

Field notes


Photographs


A crime scene sketch


Evidence custody documents

Photographs

Photographers name


Case number


Type of case


Date of photo

Measurements

Triangulation


Rectangular coordinate method


Base line

Search

Strip method


The grid


The zone method


The spiral method

Physical evidence

Most important type of evidence in establishing the guilt of the accused

Follow up procedures

Review of existing info


Discuss with other officers for m.o., motive, theory of what happened


Re-interview witnesses


Identify, locate, and interview additional witnesses


Identify possible suspects


Establish suspects intent, capability, opportunity, motive


Search sources to find and arrest suspect


Once arrested learn all from suspect


Try and get confession


Prepare case for court


Report- crime was committed and what type, defendants involvement, evidence and chain of custody, present material orderly and logically, identify competent witnesses


Discuss case with prosecutor


District attorney gets copy of documents

Establish modus operandi M.O.

To show pattern of criminal behavior


Associate numerous crimes with a single suspect


Possibly predict the perpetrators next target


Assist investigators in recognizing the characteristics of criminal activity