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Transcript

Bite Marks

The 7 S's of Securing a Crime Scene

1. Securing the Scene

2 Separating the Witnesses

3. Scanning the Scene

4. Seeing the Scene

5. Sketching the Scene

6. Searching for Evidence

7. Securing and Collecting Evidence

All of the 7 S's were followed correctly

Crime Scene

After Joubert had kidnapped the victims he put them in the back of his car. When he got pulled over by the school for being a suspicious person, the police searched his car and found that thehair in the trunk of his car matched the hair of one the boys who were murdered .

The Crime Scene

In 1982 Joubert was also linked back to a murder in Maine of another young boy. He left bite marks on the victim which was then able to trace back to Joubert.

Hair is a type trace, class, biological and individual evidence

The hair found during this case helped the police connect John Joubet to the two murdered of the two boys.

Rope (fibers)

Photo of the crime scene from above

Hair

Rope (fibers): circumstancial, class, trace

Hair: circumstancial, biological, class, trace

Bite Marks: circumstancial, individual, class

Eye Witness: Direct evidence

Rope used to tie up Danny's hands

Joubert used this rare kind of rope to tie up one of his victims. Since it was so rare it was easy to connect him to the murder when the police found the same type of rope in his car

Eyewitness

Rope (fibers) is circumstancial, trace and class evidence

Since John Joubert was lurking around the school a witness was able to have an accuate description of him and report it to the police. This police report made it possible for the police to track Joubert's car and search his car.

Locard's Principle is the fundamental reasoning behind the use of trace evidence in forensic investigation

Eye Witness is a type of direct evidence

Direct Transfer: when fibers are transferred from victim to suspect of suspect to victim

Secondary Transfer: Fibers that the suspect picked up then transferred to the victim

This is the sketch the sketch artist was able to draw based on the witness description.

Natural Fiber: Come from animals, plants, and minerals that are mined from the ground

Synthetic Fiber: man- made fibers

Chris' clothing found by the crime scene

Work Cited

Works Cited

http://www.criminaljusticeschools.org/blog/10-famous-cases-cracked-by-forensics/

http://murderpedia.org/male.J/j1/joubert-john-photos.htm

Pictures Cited

http://murderpedia.org/male.J/j1/joubert-john-photos.htm

http://iparkerforensics.blogspot.com/p/hair-anf-fiber-analysis.html

Conclusion

Indroduction

DNA and Fingerprint Evidence

Fingerprints:

After all the evidence found was linked back to Joubert, he was convicted of three murders. Then in 1996 John Joubert was sentenced to death by electric chair.

  • Fingerprint evidence was not used on this case
  • Types of fingerprints are: Loop, Whorl, and arch
  • To match a valid fingerprint one must look at unique ridge patterns, deltas, and the diffferent minutiae patterns

DNA:

In 1983 two schoolboys were found murdered in Omaha, Nebraska. One of the boys was found tied up with a stange rope that they were not able to identify. Thankfully police were already investigating a strange man scouting that school, they were then able to trace the license plate back to Joubert. Once they searched his car they were able to find the same unidentified rope and hair matching to the victims. He was then linked to another murder where his teeth matched a bite mark on a young boy. Later he was sentenced to death by electric chair.

  • DNA was also not used in this case either
  • DNA can be extracted by relatively small amounts of biological evidence, such as a drop of blood or a hair follical
  • DNA fingerprinting can identify a person linked to the crime as well as and can accurately

The Victims

Chris Walden: Walking to school when he was kiddnapped

Danny Joe Eberle: First known victim who disappeared while delivering newspapers

John Joubert: Serial Killer

By Sam Ames

P.1

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