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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


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


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


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

Sources of statements




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


Field notes


A crime scene sketch

Evidence custody documents


Photographers name

Case number

Type of case

Date of photo



Rectangular coordinate method

Base line


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