1. How could investigators prove a crime if it was committed by an identical twin?
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Room:

2. Biology of Twins

3. DNA of twins

4. That was what investigators in Jefferson County, Colo
That was what investigators in Jefferson County, Colo. faced in the summer of 2003 when a young mother disappeared and was later found murdered. Police believed she was killed by her husband with help from his identical twin, but couldn't find enough evidence to prove it.

5. Anh Tong (left) and Duc Tong (right) were arrested after a fatal stabbing took place on Jan. 26. Duc Tong was originally charged with the murder, but this charge was later dropped and shifted to his twin brother Anh.

6. The judge found probable cause to hold both 19-year-olds in jail without bond, despite a defense attorney argument that Manuel was not placed at the scene by a witness

7. In 1999 in Grand Rapids, Michigan, when a female student was hit over the head and raped. Five years later, police matched DNA from the attack to Jerome Cooper - but he has an identical twin, Tyrone. Both brothers already had records for sexual assault

8. Identical Twins Charged With Rape
Identical Twins Charged With Rape! Mohammed and Aftab Asghar, 22, were both arrested after DNA evidence was found at the scene which provided a possible link to one, or both, the brothers. DNA Couldn't Prove Who Committed the Crime.

9. The police in Marseille France are struggling to solve a sexual assault case. They have solid video evidence and have even matched DNA from the crime scene with two suspects but they still can’t figure it out. See, the problem is that the suspects are identical twins.

10. In 2009, jewelry with a retail value of six million euros ($8
In 2009, jewelry with a retail value of six million euros ($8.2m) was stolen from Berlin's KaDeWe department store. Traces of DNA were found in a glove found at the crime scene, and once again the DNA led police to twin brothers, who walked free.

11. If we can’t use DNA, what can we use?
Do identical twins have identical fingerprints?
The basic answer is NO.

12. Adapted from PPT by T. Trimpe 2007 http://sciencespot.net/
Fingerprints
Forensic Science
Adapted from PPT by T. Trimpe

13. While a fetus is forming, the pads on the fingers and palms start to develop between weeks six to 13. The fingerprints are complete by the time he is six months along.

14. How Fingerprints Form
Basal layer grows faster than the epidermis on the outside and the inner dermis.
The basal layer buckles and folds in several directions, forcing complex shapes.

15. Fingerprint Principles
According to criminal investigators, fingerprints follow 3 fundamental principles:
A fingerprint is an individual characteristic; no two people have been found with the exact same fingerprint pattern.
A fingerprint pattern will remain unchanged for the life of an individual; however, the print itself may change due to permanent scars and skin diseases.
Fingerprints have general characteristic ridge patterns that allow them to be systematically identified.

16. History of Fingerprints

17. First Fingerprint Trial
Directions: Read the article. Summarize in 3 to 4 sentences.

18. Classifying Fingerprints