Comments on: explain why DNA fingerprinting can be used as evidence in law enforcement? http://www.lifemapdna.com/explain-why-dna-fingerprinting-can-be-used-as-evidence-in-law-enforcement.html Thu, 08 Sep 2011 20:10:50 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: k http://www.lifemapdna.com/explain-why-dna-fingerprinting-can-be-used-as-evidence-in-law-enforcement.html/comment-page-1#comment-1413 k Sat, 21 Nov 2009 10:27:45 +0000 http://www.lifemapdna.com/explain-why-dna-fingerprinting-can-be-used-as-evidence-in-law-enforcement.html#comment-1413 DNA fingerprinting can be used as evidence in law enforcement because everybody has a unique set of fingerprints. Not one person has the same fingerprints as anyone else. So if the police have found fingerprints on a stolen car, and they don't belong to the owner. Then they can find the criminal by their fingerprints. DNA fingerprinting can be used as evidence in law enforcement because everybody has a unique set of fingerprints. Not one person has the same fingerprints as anyone else. So if the police have found fingerprints on a stolen car, and they don’t belong to the owner. Then they can find the criminal by their fingerprints.

]]> By: jamus d woespuss http://www.lifemapdna.com/explain-why-dna-fingerprinting-can-be-used-as-evidence-in-law-enforcement.html/comment-page-1#comment-1414 jamus d woespuss Sat, 21 Nov 2009 10:27:45 +0000 http://www.lifemapdna.com/explain-why-dna-fingerprinting-can-be-used-as-evidence-in-law-enforcement.html#comment-1414 BEWARE THAT IDENTICAL TWINS HAVE THE SAME "DNA FINGERPRINT" BEWARE THAT IDENTICAL TWINS HAVE THE SAME "DNA FINGERPRINT"

]]> By: Agent D ( MIB ) http://www.lifemapdna.com/explain-why-dna-fingerprinting-can-be-used-as-evidence-in-law-enforcement.html/comment-page-1#comment-1415 Agent D ( MIB ) Sat, 21 Nov 2009 10:27:45 +0000 http://www.lifemapdna.com/explain-why-dna-fingerprinting-can-be-used-as-evidence-in-law-enforcement.html#comment-1415 The human DNA, is a complex substance, Every Individuval is different , they are unique because of the DNA. as no one can alter the DNA, the police use this as an effective tool to crime investigation. The human DNA, is a complex substance, Every Individuval is different , they are unique because of the DNA.

as no one can alter the DNA, the police use this as an effective tool to crime investigation.

]]> By: delkaine http://www.lifemapdna.com/explain-why-dna-fingerprinting-can-be-used-as-evidence-in-law-enforcement.html/comment-page-1#comment-1412 delkaine Sat, 21 Nov 2009 10:27:45 +0000 http://www.lifemapdna.com/explain-why-dna-fingerprinting-can-be-used-as-evidence-in-law-enforcement.html#comment-1412 DNA fingerprinting has nothing to do with your actual fingerprints (outside that of your dna makes your fingerprints, along with everything else in your body). It is the art/science of matching suspects with bodily fluids or skin and hair found at a crime scene. There are certain sequences of chemicals that make up dna that give rise to the differences found in people. There are problems with this. It usually only gives a high prbability of match, not a definate match like all the tv shows try to portray. It may show matches to people who wernt even at the scene but are blood relatives of the criminal. "[T]hat probability might be 1 in 20 billion, which would indicate that the person can be reasonably matched with the DNA fingerprint; then again, that probability might only be 1 in 20, leaving a large amount of doubt regarding the specific identity." It can also be faked. "The value of DNA evidence has to be seen in light of recent cases where criminals planted fake DNA samples at crime scenes. In one case, a criminal even planted fake DNA evidence in his own body: Dr. John Schneeberger raped one of his sedated patients in 1992 and left semen on her underwear. Police drew Schneeberger's blood and compared its DNA against the crime scene semen DNA on three occasions, never showing a match. It turned out that he had surgically inserted a Penrose drain into his arm and filled it with foreign blood and anticoagulants." So, while still a good forensic tool, it is not foolproof. DNA fingerprinting has nothing to do with your actual fingerprints (outside that of your dna makes your fingerprints, along with everything else in your body). It is the art/science of matching suspects with bodily fluids or skin and hair found at a crime scene. There are certain sequences of chemicals that make up dna that give rise to the differences found in people. There are problems with this. It usually only gives a high prbability of match, not a definate match like all the tv shows try to portray. It may show matches to people who wernt even at the scene but are blood relatives of the criminal. "[T]hat probability might be 1 in 20 billion, which would indicate that the person can be reasonably matched with the DNA fingerprint; then again, that probability might only be 1 in 20, leaving a large amount of doubt regarding the specific identity."
It can also be faked. "The value of DNA evidence has to be seen in light of recent cases where criminals planted fake DNA samples at crime scenes. In one case, a criminal even planted fake DNA evidence in his own body: Dr. John Schneeberger raped one of his sedated patients in 1992 and left semen on her underwear. Police drew Schneeberger’s blood and compared its DNA against the crime scene semen DNA on three occasions, never showing a match. It turned out that he had surgically inserted a Penrose drain into his arm and filled it with foreign blood and anticoagulants."
So, while still a good forensic tool, it is not foolproof.

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