Forensic Chemistry Division provides scientific support to law enforcement with the state-of-the-art analytical techniques. The goal is to contribute the identification of chemical substances and the reconstruction of crime scene in various cases, such as murders, assaults, suicides, arson, explosion, chemical leaking, terror, addiction, etc. The division also conduct the analysis of biological evidences in the case of driving under the influence of alcohol(DUIA), sexual assault cases, and alcohol/disease related death cases.
Analysis of various trace evidence (fibers, paints, glass, soils, etc.) found at crime scenes
Determination of a source of origin and comparison of questioned materials to known materials based on stable isotope ratio and multi-elemental analyses
Analysis of blood alcohol concentration(BAC) and biomarkers for death related diseases in cases of driving under the influence of alcohol(DUIA), sexual assault cases, and postmortem cases.
Analysis on acids, alkalis, hazardous chemicals, environmental pollutants, harmful gases
Flammable liquids, organic solvents, ketone bodies, illicit oils
The Forensic Chemistry Division consists of five sections including Trace Evidence Analysis Lab., Chemical Fingerprint Analysis Lab., Hazardous Chemical Analysis Lab., Volatile Substance Analysis Lab., and Blood Alcohol Content Analysis Lab.
Performs analysis on trace evidence includes fibers, resins, paints, and different types of foreign materials related to various cases such as murder, robbery, theft, crash, etc.. Analysis of trace evidence is performed by infrared spectroscopy (FT-IR), microspectrophotometry(MSP), Raman spectroscopy, and X-ray fluorescence spectroscopy (XRF), X-ray diffractometer (XRD) with various microscopes (stereoscopic microscope, high magnification microscope, polarizing light microscope, etc.).
Determines a source of origin and performs comparison of questioned materials to known materials based on chemical fingerprints of substances by the stable isotope ratio and multi-elemental analyses. Trace elements and isotope composition of materials vary depending on a source of origin and raw materials used for manufacturing products. Chemical fingerprint analysis is performed using the-state-of-the-art instrument (LA-ICP-MS, IRMS, XRF, XRD, etc.) to determine a source of origin and to perform comparison of questioned materials to known materials such as paint chips, tape, glass fragments, and so on. The laboratory has established a database of glass, soil, tape, etc. to achieve goals by the stable isotopes and multi-elemental analyses.
Determines the presence and concentration of various hazardous chemical substances, including heavy metals and acids in water, soil and waste in different forensic environmental cases. In addition, the lab performs the analysis of chemical agent components from biological samples, related to leak, spraying, suicide, homicide, and poisoning cases including misuse and abuse, etc..
Analyzes ignitable liquids from fire residues collected from fire scenes to determine whether ignitable liquids are related to the case. Also, the lab analyzes and evaluates the authenticity of oil in fraud oil cases, the causative material of an accident in explosion or fire cases, and hazardous gases in accidental poisoning and suicide cases.
Conducts the analysis of biological evidences in the case of driving under the influence of alcohol(DUIA), sexual assault cases, and alcohol/disease related death cases. The lab confirms the alcohol concentration and measures the content related to decomposition index substances and drinking in blood and other tissues of postmortem specimens performing ketone analysis, which is an index substance for chronic alcoholism and diabetes. Recently, the lab has developed a new method to determine the consumption of alcohol analyzing the ethanol metabolites(EtG and EtS) from blood and urine samples.
A suspect who was operating a bakery of T company (Pyeongtaek) spread false information via Internet that a rat came out from the bread that the suspect purchased from a neighboring bakery of P company and was accused by the P company due to defamation and obstruction of business. As a result of inspection, the foreign body in the bread was a house rat caught by a rat trap, and the chestnut bread was found to be made with the raw materials of T company that the suspect was operating, not made by P company.
While transporting 31 OLED TVs of S electronics for the “International Household Appliance Exposition" held in Berlin, Germany, two were lost. Analysis was requested to identify if the tape used for the last sealing for the box having contained the lost TVs was made in Korea or in Germany. Based on the value of hydrogen stable isotope ratio, it was concluded that the tape was highly likely to be made in a 3rd country not in Korea or Germany.
After five residents of a village drank soju at Cheongsong-gun Village Hall, two persons fell unconscious and one of them died during transport. While investigating the people involved, A, a resident in the village, committed suicide by taking poison at his barn. The coidentity of the pesticide collected in the village with the one contained in soju was analyzed. The pesticide contained in soju was Samgong methomyl produced in October 2011, which was different from the product stored by the residents of the village, and its stable isotope ratio was similar to that of the pesticide taken by the suspect.
As the price of the monochrome that is a representative work of Lee U Fan named “From dots and from lines” had risen, there was a rumor that paintings suspected as forgeries of his works were being distributed on the market. Thus, analysis was requested to identify whether the paintings randomly submitted from the owners were forgeries. The paints and glue used in the works were different from the works of Lee U Fan, and the works were processed to be seen as old paintings. As a result of analysis, they were identified as forgeries.
강원도 원주시 한의원에서 불임치료목적으로 지은 한약, 한약가루약(일명 반묘가루) 및 한약추출액을 혼합하여 마신 직후 환자가 사망하였으며, 감정결과 위 내용물 및 혈액에서 칸타리 딘(cantharidin)이 검출됨. 칸타리딘은 반묘의 주성분으로 치사량이 10mg이고 과량복용시 복통, 이질, 토혈, 혈뇨, 혈압 저하 등에 이어 사망한다고 알려져 있음