that is Luminol. The Luminol makes the blood glow. It is useful in detecting the bloodstains at the scene of a crime. Other more important and significant men like Sir Alec Jeffreys are the ones to thank since they are the ones who have shaped forensics into what we know now. In 1984, he developed the DNA fingerprinting technique to examine the variations in the genetic code, which can be used to distinguish one individual from another. Kary B. Mullis was also another man who the world of medicine and criminology should not thank enough. Kary in 1993, he developed the PCR technique that was used to amplify the samples of DNA fragments in-vitro. This technique was useful for amplifying the DNA sample obtained from the scene of a crime in an extremely minute amount, degraded state, and a mixture of body fluids of two or more people. This technique has also gone on to not only solve crimes but also other things like detecting diseases, viruses, and many other dna related subjects. DNA analysis DNA, or deoxyribonucleic acid, is one of the most popular pieces of evidence to recover at a crime scene. More often than not, evidence containing DNA is regarded to as biological evidence. With all of the substantial advances that have been made regarding DNA, biological evidence is recognized to be the golden standard in forensic science. At the scene, biological evidence must be initially visibly recognized. Sometimes this is not always possible and the aid of an alternative light source, or ALS, is required. Once identified as a potential source, presumptive tests are conducted to establish the possibility of the specified biological presence (semen, saliva, blood, urine, etc.). If positive, samples are collected and submitted for analysis in the laboratory, where confirmatory tests and further tests are performed. DNA analysis has numerous applications such as paternity testing, identifications of unknown human remains, cold case breakthroughs, as well as connecting suspects and/or victims to a piece(s) of evidence, a scene, or to another person (victim or suspect, respectively). Nuclear DNA evidence can be recovered from blood, semen, saliva, epithelial cells and hair (if the root is still intact). Furthermore, Mitochondrial DNA can be recovered from the shaft of hair, bone and the roots of teeth. For most forensic DNA samples, STR analysis of autosomal short tandem repeats is performed in an attempt to individualize the sample