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By: Capt. S B Tyagi, FISM, CSC What makes a serial killer tick? How do forensic experts solve crimes using cutting-edge technology? Who are the men and women that risk their lives to put criminals behind bars? These questions and more are related to the subject of Crime Investigation. Real crime, real people, real drama - Crime Investigation is the hard work by the true professionals who work meticulously and methodically to solve the mystery behind the crime – motive, the modus-operendai and men involved in crime! Crime Investigation opens the door to crime labs, police archives and courtrooms, providing a behind-the-scenes look at criminal investigations and probing unexplained mysteries. Physical Evidence at a Crime Scene Evidence used to resolve an issue can be split into 2 areas - testimonial evidence and physical evidence. The testimonial evidence would be any witnessed accounts of an incident. The physical evidence would refer to any material items that would be present on the crime scene. These items would be presented in an issue or incident to prove or disprove the facts of the issue. What will evidence collected at a scene do for the investigation - • May prove that a crime has been committed. • Establish any key elements of a crime. • Link a suspect with a scene or a victim. • Establish the identity of a victim or suspect. • Corroborate verbal witness testimony. • Exonerate the innocent. The evidence that is located and recovered at a scene will give the detectives responsible for the investigation leads to work with in the case.
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Crime Crime InvestigationInvestigation
By: Capt. S B Tyagi, FISM, CSC
Capt S B [email protected]
Why investigations….Why investigations….
• What makes a serial killer tick? What makes a serial killer tick? • How do forensic experts solve How do forensic experts solve
crimes using cutting-edge crimes using cutting-edge technology? technology? • Who are the men and Who are the men and
women that risk their women that risk their lives to lives to put criminals behind put criminals behind bars?bars?
Capt S B [email protected]
• Crime Investigation is the hard Crime Investigation is the hard work by the true professionals work by the true professionals who work meticulously and who work meticulously and methodically to solve the methodically to solve the mystery behind the crime – mystery behind the crime –
Why investigations….Why investigations….
•The motive, The motive, •The modus-operendai, The modus-operendai, and and •The men involved in The men involved in crime!crime!
Capt S B [email protected]
Types of evidenceTypes of evidence
– The testimonial evidence The testimonial evidence would be any witnessed would be any witnessed accounts of an incident. accounts of an incident.
– The physical evidence would The physical evidence would refer to any material items refer to any material items that would be present on that would be present on the crime scene. the crime scene.
Evidence used to resolve an issue can Evidence used to resolve an issue can be split into 2 areas - testimonial be split into 2 areas - testimonial evidence and physical evidence.evidence and physical evidence.
Capt S B [email protected]
Physical Evidence at a Physical Evidence at a Crime SceneCrime Scene
• May prove that a crime has been May prove that a crime has been committed. committed.
• Establish any key elements of a Establish any key elements of a crime. crime.
• Link a suspect with a scene or Link a suspect with a scene or victim. victim.
• Establish the identity of a Establish the identity of a victim victim or suspect.or suspect.• Corroborate verbal witness Corroborate verbal witness testimony.testimony.• Exonerate the innocent.Exonerate the innocent.
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Varieties of EvidenceVarieties of Evidence
• Impressions include fingerprints, tool Impressions include fingerprints, tool marks, footwear, fabric impressions, marks, footwear, fabric impressions, tire marks and bite marks. tire marks and bite marks.
• Forensic Biology includes blood, Forensic Biology includes blood, semen, body fluids, hair, nail semen, body fluids, hair, nail scrapings, blood stain patterns.scrapings, blood stain patterns.
• Trace Evidence includes gun Trace Evidence includes gun shot shot residues, arson accelerant, residues, arson accelerant, paint, paint, glass and fibers. glass and fibers. • Firearms - includes Firearms - includes weapons, gun weapons, gun powder patterns, casings, powder patterns, casings, projectiles, fragments, projectiles, fragments, pellets, pellets, wadding and cartridges.wadding and cartridges.
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Processing the Crime SceneProcessing the Crime Scene
• In an Organized approach In an Organized approach to Crime Scene to Crime Scene Investigations there are Investigations there are three (3) basic and simple three (3) basic and simple stages in properly stages in properly processing the crime processing the crime scene. Those stages scene. Those stages consist of –consist of –– Scene Recognition, Scene Recognition, – Scene Documentation and Scene Documentation and – Evidence Collection. Evidence Collection.
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An organized approach An organized approach assures:assures:• A thorough and legal A thorough and legal
search is conducted. search is conducted. • Expeditious processing Expeditious processing
without compromise. without compromise. • Proper scene Proper scene
documentation. documentation. • Proper methods and Proper methods and
techniques for techniques for evidence recovery. evidence recovery.
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• Proper use and knowledge Proper use and knowledge of resources and of resources and equipment. equipment.
• All pertinent evidence All pertinent evidence recovery. recovery.
• Proper handling and Proper handling and packaging of evidence. packaging of evidence.
• Proper distribution points Proper distribution points for evidence analysis. for evidence analysis.
• Proper safety precautions Proper safety precautions are followed. are followed.
An organized approach An organized approach assures:assures:
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Do what is right…Do what is right…
For that reason For that reason alone!alone!
Lodging FIR.ppt
Capt S B [email protected]
Capt SB Tyagi, COAS’CC, FISM, CSC, CSPCapt SB Tyagi, COAS’CC, FISM, CSC, CSP
At : [email protected] E-mail : [email protected] ; : [email protected] My Blog: : http://captsbtyagi.blogspot.comMy 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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