The Following are examples of STR in real life pictures and the first case that started it as well as the OJ Simpson case.
Certain labs that do not follow the right protocol can cause the criminal to get away and the victim as well as his/her family not to get justice. Recently Houston PD/Crime Lab has been under fire for their lab ethics.
Figure 1
Two of the DNA profiles that led to the conviction of Tommie Lee Andrews for rape in 1987. The two DNA probes seen here were used to characterize DNA isolated from the victim, the semen left by the rapist, and the suspect. The dark channels are multiband controls. There is a clear match between the suspect’s DNA and the DNA of the rapist’s semen in these.
- Compare the restriction endonuclease patterns of the semen to that of the suspect Andrews. You can see that the suspect’s two patterns match that of the rapist (and are not at all like those of the victim). Clearly the semen collected from the rape victim and the blood sample from the suspect came from the same person. The suspect was Tommie Lee Andrews, and on November 6, 1987, the jury returned a verdict of guilty. Andrews became the first person in the United States to be convicted of a crime based on DNA evidence
Figure 2
The DNA profiles of O. J. Simpson and blood samples from the murder scene of his former wife from his highly publicized and controversial murder trial in 1995.
http://elitedaily.com/wp-content/uploads/2012/10/elite-daily-oj-simpson-jail.jpg
As the man who analyzed Andrews’ DNA says: “It’s like leaving your name, address, and social security number at the scene of the crime. It’s that precise.” Of course, laboratory analyses of DNA samples must be carried out properlysloppy procedures could lead to a wrongful conviction. After widely publicized instances of questionable lab procedures, national standards are being developed.
The genomes of several organisms have been completely sequenced. When DNA is digested with restriction endonucleases, distinctive profiles on electrophoresis gels can be used to identify the individual that was the source of the tissue.
http://www.txtwriter.com/Backgrounders/Genetech/GEpage14.html