earticle

영어

This paper reports a murder case in which critical DNA evidence was provided through additional analysis of a bag strap that was used as the murder tool. Samples were first transferred from the surface of the bag strap by applying sterile cotton swabs before the whole bag strap was torn apart for further additional analysis. DNA was extracted from both kinds of sample, and the ratio of total to male DNA was quantified the success rate of this DNA type analysis was confirmed. In the samples from the cotton swab transfer, only the DNA type of the victim was detected with the autosomal short tandem repeat (A-STR) analysis, and no DNA type was detected with theY chromosome short tandem repeat (Y-STR) analysis. However, in the samples from the torn material, both the DNA type of the victim and that of the suspect were detected with the A-STR analysis, and the DNA type of the suspect was also detected with the Y -STR analysis. These results, suggest that more reliable data may be obtained by applying different sampling methods depending on the type and status of the evidence.