earticle

영어

In this study, we studied blood detection test and DNA typing from washed bloodstain samples. We considered the conditions of the washing time (using chlorine bleach), drying time and the type of detergent. Regardless of the drying time of the blood, bio detergent, non-bio detergent was found to be positive in all samples for the blood washing and STR (Short Tandem Repeat) was detected only in the samples dry at least 12 hours. Washing with chlorine bleach, blood detection test showed positive results only from the blood stains dried less than 4 hours, but STR was not detected in all samples, regardless of the drying time of the blood, and returned positive results in blood detection test and STR from all the samples that were dried for 24 hours and washed less than 10 minutes. Therefore, blood detection test and STR typing are influenced by various fac tors, including external factors such as the type of detergent, internal factors such as blood drying time. Thus it should be careful in judging if there is blood-stain or STR from the evidence prepared from an incident.