Some facts about Forensic DNA

The old traditional methods of criminal investigations gave forensic experts a tedious job. They relied only in witnesses and visual presentation. But how about the unseen cases of murders and other criminal acts? Because of the advancement of technology and human knowledge, forensic experts collect evidence around the crime scene including hair remains, liquids like saliva, semen and others. These are the good sources of excellent evidence in connection with the DNA or the so called Deoxyribonucleic acid. organisms can be identified uniquely by their DNA sequences and basically it cannot be forged, altered or faked in any way. To do this, forensic experts scan about 13 DNA regions that vary from person to person and it will be used to create a DNA profile or DNA fingerprint. According to research, there is very small chance that another person has the same DNA structure and not even the identical twins. Forensic experts uses DNA to match organ donors, detect bacteria that may pollute water and soil, identify crimes and victims and many others.

How are fingerprints used for computer security and why?

An individual’s fingerprints remain the same throughout his or her entire life. Minor cuts or abrasions, and some skin diseases such as eczema or psoriasis, may cause temporary disturbances to the fingerprints, but upon healing the fingerprints will return to their original pattern. More serious injuries to the skin that damage the dermis might leave scars that change or disrupt the ridge pattern of the fingerprints, but examining the skin outside the area of damage will reveal the same fingerprint pattern.

Recent technological advances using optical scanners and solid-state readers use software to analyze the geometric pattern of fingerprints and compare it with those of registered, legitimate users of a network system.Less expensive models of these devices have false acceptance rates of less than 25 per million and false rejection rates of less than three percent.Possible applications include using fingerprints instead of passwords for computers, linking to individual bank accounts and automated teller machines, and for credit cards and Internet transactions.