BTK Killer Dennis Rader
BY: Tae Yeon
BTK KILLER
Dennis Rader is a BTK (Blind, Torture, Kill) Killer who murdered 10 people in Wichita the town from Kansas He's murder started from the year 1974 ~ 1991. Also he mostly killed Females. He used unusual weapons; such as plastic bag, belt, nylon stocking, rope ect. It took a lot time for police to find the BTK killer, they found him by his daughter's DNA and his fingerprints, Digital footprints and his signature and lastly his floppy disks.
Dennis Rader Early Life
The Mode Operation Of BTK Killer
"The BTK killer usually targeted his neighbors where he thought that women would be alone and gathered information about his victim to the extent of stalking them" - Yahoo News
Apprehension
Dennis Rader's 3 Important Evidence
DNA
The BTK Killer's DNA was collected from his daughter and the Forensic Scientists matched it with his DNA. Which matched and brought the BTK Killer to jail.
Floppy Disk
The floppy disk was used as his agenda of his meeting with the church councils. He thought he was smarter then anybody in this world and he thought nobody could stop him.
Signature
The BTK's signature was easy to investigate because it had a meaning of his name combined with "sexually suggestive configuration".
Forensic Technique (DNA)
How does DNA work? (Techniques and Equitments)
1. DNA Collect
First you collect the DNA from the person. DNA can be found in Hair, Fingernails/Toenails, ect.
2. Cell Isolation
Secondly, when you give your examples of DNA the scientists will isolate your DNA.
3. DNA Extraction
In this step the scientist extract from DNA from the cells using a process called "Lysis". During the lysis step, the cells are subjected to high heat to break open the cell membrane. Once the cell membrane is broken, the DNA released into the solution.
4. PCR Amplification
PCR stand for "Polymerase Chain Reaction". During the PCR process, the DNA strands are separated at high temperature. "Primers" are added to the reaction. After the primers have annealed around the parts of DNA to be examined, the conditions are changed and the region of interest is duplicated using a chemical called TAQ Polymerase. Just in hours the PCR will produce a million of copies of DNA.
5. Sequencing
Sequencing is the last step of the DNA testing. It allows the scientists to see the Y- chromosomes. During this sequences , the amplified DNA is drawn up a capillary which contains a gel matrix.
6. Analyze
This is the final step scientist take to finish the DNA testing. In this step scientist puts all the data in a computer and summaries the DNA sample. Also the report is written after this step.
The Beginning Of DNA Testing
The Limitation Of DNA Testing
Matching DNA from a crime scene to DNA taken from the suspect is not an absolute guarantee of the suspects' guilt. Instead Forensic Scientist likes to talk about the probabilities. For example: they might take the chance of a crime DNA testing and getting it right is 1:7000. In the 1: 7000 might include people who are the involved in the crime scene. In the conclusion, DNA testing is a strong evidence of crime scene, however, it also can assume some people who were not involved in the crime scene.