The document outlines the critical aspects of crime investigation, highlighting the importance of understanding motives, methods, and the individuals involved in crimes. It details different types of evidence used in solving crimes, including testimonial and physical evidence, and emphasizes the organized approach to processing crime scenes through recognition, documentation, and evidence collection. It underscores the necessity for thoroughness, proper techniques, and safety measures in crime investigations to ensure justice.

1. Crime InvestigationCrime Investigation
By: Capt. S B Tyagi, FISM, CSC

2. Capt S B Tyagi
sbtyagi@gail.co.in
Why investigations….Why investigations….
• What makes a serial killer tick?What makes a serial killer tick?
• How do forensic experts solve crimesHow do forensic experts solve crimes
using cutting-edge technology?using cutting-edge technology?
• Who are the men andWho are the men and
women that risk their lives towomen that risk their lives to
put criminals behind bars?put criminals behind bars?

3. Capt S B Tyagi
sbtyagi@gail.co.in
• Crime Investigation is the hard workCrime Investigation is the hard work
by the true professionals who workby the true professionals who work
meticulously and methodically tometiculously and methodically to
solve the mystery behind the crime –solve the mystery behind the crime –
Why investigations….Why investigations….
•The motive,The motive,
•The modus-operendai,The modus-operendai,
andand
•The men involved inThe men involved in
crime!crime!

4. Capt S B Tyagi
sbtyagi@gail.co.in
Types of evidenceTypes of evidence
– The testimonial evidence wouldThe testimonial evidence would
be any witnessed accounts of anbe any witnessed accounts of an
incident.incident.
– The physical evidence wouldThe physical evidence would
refer to any material items thatrefer to any material items that
would be present on the crimewould be present on the crime
scene.scene.
Evidence used to resolve an issue canEvidence used to resolve an issue can
be split into 2 areas - testimonialbe split into 2 areas - testimonial
evidence and physical evidence.evidence and physical evidence.

5. Capt S B Tyagi
sbtyagi@gail.co.in
Physical Evidence at a CrimePhysical Evidence at a Crime
SceneScene
• May prove that a crime has beenMay prove that a crime has been
committed.committed.
• Establish any key elements of a crime.Establish any key elements of a crime.
• Link a suspect with a scene or victim.Link a suspect with a scene or victim.
• Establish the identity of a victimEstablish the identity of a victim
or suspect.or suspect.
• Corroborate verbal witnessCorroborate verbal witness
testimony.testimony.
• Exonerate the innocent.Exonerate the innocent.

6. Capt S B Tyagi
sbtyagi@gail.co.in
Varieties of EvidenceVarieties of Evidence
• Impressions include fingerprints, toolImpressions include fingerprints, tool
marks, footwear, fabric impressions, tiremarks, footwear, fabric impressions, tire
marks and bite marks.marks and bite marks.
• Forensic Biology includes blood, semen,Forensic Biology includes blood, semen,
body fluids, hair, nail scrapings, blood stainbody fluids, hair, nail scrapings, blood stain
patterns.patterns.
• Trace Evidence includes gun shotTrace Evidence includes gun shot
residues, arson accelerant, paint,residues, arson accelerant, paint,
glass and fibers.glass and fibers.
• Firearms - includes weapons, gunFirearms - includes weapons, gun
powder patterns, casings,powder patterns, casings,
projectiles, fragments, pellets,projectiles, fragments, pellets,

7. Capt S B Tyagi
sbtyagi@gail.co.in
Processing the Crime SceneProcessing the Crime Scene
• In an Organized approach toIn an Organized approach to
Crime Scene InvestigationsCrime Scene Investigations
there are three (3) basic andthere are three (3) basic and
simple stages in properlysimple stages in properly
processing the crime scene.processing the crime scene.
Those stages consist of –Those stages consist of –
– Scene Recognition,Scene Recognition,
– Scene Documentation andScene Documentation and
– Evidence Collection.Evidence Collection.

8. Capt S B Tyagi
sbtyagi@gail.co.in
An organized approach assures:An organized approach assures:
• A thorough and legalA thorough and legal
search is conducted.search is conducted.
• Expeditious processingExpeditious processing
without compromise.without compromise.
• Proper sceneProper scene
documentation.documentation.
• Proper methods andProper methods and
techniques for evidencetechniques for evidence
recovery.recovery.

9. Capt S B Tyagi
sbtyagi@gail.co.in
• Proper use and knowledge ofProper use and knowledge of
resources and equipment.resources and equipment.
• All pertinent evidenceAll pertinent evidence
recovery.recovery.
• Proper handling and packagingProper handling and packaging
of evidence.of evidence.
• Proper distribution points forProper distribution points for
evidence analysis.evidence analysis.
• Proper safety precautions areProper safety precautions are
followed.followed.
An organized approach assures:An organized approach assures:

10. Capt S B Tyagi
sbtyagi@gail.co.in
Do what is right…Do what is right…
For that reason alone!For that reason alone!
Lodging FIR.pptLodging FIR.ppt

11. Capt S B Tyagi
sbtyagi@gail.co.in
Capt SB Tyagi, COAS’CC, FISM, CSC, CSPCapt SB Tyagi, COAS’CC, FISM, CSC, CSP
At : sbtyagi@gail.co.in
Alternate E-mail : captsbtyagi@indiatimes.com ;
: sbtyagi1958@gmail.com
My Blog: : http://captsbtyagi.blogspot.com
My web-site : http://sbtyagi.wix.com/iciss
ICISS at LinkedIn : http://www.linkedin.com/groups?
gid=4413505&trk=hb_side_g
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