Loading...
主管:中华人民共和国司法部
主办:司法鉴定科学研究院
ISSN 1671-2072  CN 31-1863/N

Archive

    2012 Issue 5 (Total No. )
    Published: 15 September 2012
    Previous Issue    Next Issue

    Forensic System

    For Selected: Toggle Thumbnails
    Forensic System
    On the Amendment and Improvement of Forensic Appraisal in Civil Litigation
    WU Gao-Qing, QI Pei-Jun
    2012(5): 1-5. 
    Abstract ( )   PDF (661KB) ( )  
    The amendment of the Civil Procedure Law has made great adjustment and amendment to the appraisal system. This is important for improving the quality of judicial appraisal, protecting the litigants’ rights, enhancing the evidence adoption ability of the judges and promoting justice. But there are still some problems and defects. They should be improved through some measures, such as, limiting the court’s power to directly appoint appraisers, making clear that appraisers should appear in court for cross-examination, and improving the rules of cross-examination in court for appraisers from different localities.
    Related Articles | Metrics
    Problems and Countermeasures Regarding Appraisal in Civil Procedure
    CHEN Gang
    2012(5): 6-11. 
    Abstract ( )   PDF (957KB) ( )  
    One of the reasons leading to the “chaos of appraisal” is that the appraisal in civil litigation has two purposes: to help judges in making determinations and to enhance the litigants’ attack or defense. It is rational in the current forensic system. The “chaos of appraisal” has not caused substantial harm to the goals of the civil trial system; on the contrary, it is likely to promote the realization of the goals of the civil trial system. At present, the problems of appraisal in civil procedure are the lack of protection to the right of debate, and the lack of trust in the judgment based on appraisal opinions and insufficient credibility of the civil trial. Though there are other reasons such as uneven competence of forensic units and experts, limited equipment, and non-uniform standards, to establish an equal,transparent and impartial appraisal system is a more significant task for us.
    Related Articles | Metrics
    On the Proficiency Testing of Forensic Psychiatry
    CAI Wei-xiong, FANG Jian-xin, GUAN Wei, ZHANG Qin-ting
    2012(5): 12-17. 
    Abstract ( )   PDF (1006KB) ( )  

    Proficiency testing is an important method used by countries in the world to evaluate and preserve the capacity of laboratories and inspection bodies, by making use of inter-laboratory comparisons to evaluate the ability of the participants according to pre-established criteria. Proficiency testing has also gradually become an important method of practice and supervision management in the field of forensic appraisal in China. According to the requirement from the administrative department, forensic agencies should participate in proficiency testing activities in order to demonstrate that they have the corresponding technical capacity; meanwhile the agencies should also make proficiency testing as an important method of internal quality control, identifying problems and continuous improvement. The forensic profession has been regarded as subjective and with higher risk. It is necessary and urgent in the field of forensic psychiatry to carry out proficiency testing activities. The operation results in recent years show that it is feasible to launch the proficiency testing activities in forensic psychiatry, and the evaluation result is also a true reflection of the profession’s technical level. But there are rooms for improving on project design and operation, for instance, more realistic and comprehensive preparation of samples and materials, greater effect of technical guidance and demonstration guidance, more reasonable control of the assessment difficulty, enhancing the reliability and acceptability of the result of experts’ opinions, and more flexible and diverse operation modes. There are three aspects that participating agencies should pay attention to. Firstly, the agencies should enhance their understanding about proficiency testing, strengthen the operational capacity, and treat it scientifically. Secondly, the agencies should comply with the operational guides strictly during operation, understand all the materials, grasp the key points, and pay more attention to the key points and logic of the feedback. Lastly, the explicit and exclusive conclusions should be submitted in order to strive for a satisfactory evaluation result.

    Related Articles | Metrics
    Camera Identification on YouTube
    Yannick Scheelen, Jop van der Lelie, Zeno Geradts, Marcel Worring
    2012(5): 18-30. 
    Abstract ( )   PDF (1602KB) ( )  

    Identifying the camera with which a video has been taken can under the right circumstances be done using the Photo Response Non-Uniformity(PRNU), which acts as a unique fingerprint for cameras. In this paper we use the wavelet filter from Lukás et al[1] to extract the PRNU pattern from a video file that is re-encoded using the Advanced Video Codec. Different video resolutions and encoding settings were used to investigate the influence of this re-encode on the PRNU pattern. It is shown that even after a video is re-encoded it is still possible to link some videos to their original camera.

    Related Articles | Metrics
    On the Exploitation of Secondary Fibre Transfer:

    The Use of Flock Fibres as a Tracer #br#

    Marga H. Duinmaijer, Zita Y. van Zanten, Paul van den Hoven, Karla G. de Bruin, Jaap van der Weerd
    2012(5): 40-45. 
    Abstract ( )   PDF (700KB) ( )  

    Objective Flock fibres are proposed as a tracer in cases where secondary transfer of the tracer is needed. Methods The research was carried out following a case in which people were suspected to commit large numbers of burglaries. Fibres were applied to the vehicle of the suspects and collected from later crime scenes. A device was developed to assist in the application of fibres and a number of experiments on secondary transfer were carried out. Results The device can be used to apply many fibres homogeneously in a short time. A single contact will not fully deplete the first surface from flock fibres. 1%~15% of the fibres are transferred to the 3rd surface representing the crime scene. The actual number of transferred fibres is dependent on variables such as the choice of surfaces. Conclusion The results indicate that, given the selected parameters, it is realistic to expect that relatively large numbers of fibres are transferred to a crime scene and can be collected.

    Related Articles | Metrics
    Integration of User-system View for Cyber Crime Analysis: A Semi-automatic Approach
    K.P. Chow, Erica S.L. Ho, Lucas C.K. Hui, S.M. Yiu, Tom Y.M. Lai, R.S. Xu, Y Mai, Xiaoxi Fan
    2012(5): 50-58. 
    Abstract ( )   PDF (4058KB) ( )  
    There is a rapid rise in cybercrime cases. There does not exist any effective forensic methods to deal with these cybercrime cases. Investigators are required to study the details of a large amount of tedious source in order to understand the crime model and dig out the evidence. This requires a lot of effort and may result in human errors.  In order to overcome these potential errors that may cause by the investigators, we propose a semi-automatic approach that integrates the user view (based on a high level study of the forensic investigator) and the system view (based on the automatic analysis of the source codes) to assist investigators in refining the scope of the investigation. The approach has been verified using a real cybercrime case and the method has been shown to be effective in assisting the investigators in refining the scope of investigation and understanding the crime model.  The semi-automatic approach has improved the efficiency and reliability of the digital forensic analysis of cybercrime cases involving large volume of digital evidence from multiple sources.
    Related Articles | Metrics
    Development Trends and Problems in Forensic Toxicology
    SHEN Min
    2012(5): 66-70. 
    Abstract ( )   PDF (789KB) ( )  

    This article reviews the development trends of forensic toxicology in object type, applicable sample, analysis method, application scope and result usage,and analyzes the common problems and defects of standardization, professional competence, technical system as well as quality control existing in forensic toxicology laboratories in China. It also proposes to enhance the admission control of units and personnel into forensic practice and implement practice supervision, certification and accreditation, proficiency test and peer review to assure the high level of laboratories and quality of results.

    Related Articles | Metrics
    Analysis of Cannabinoids and The Main Metabolite in Human Hair by GC-MS/MS
    ZHAO Hui, ZHUO Xian-yi, XIANG Ping, YAN Hui, SHEN Bao-hua
    2012(5): 71-74. 
    Abstract ( )   PDF (488KB) ( )  

    Objective To develop a gas chromatography-tandem mass spectrometry (GC-MS/MS) method for the simultaneous analysis of Δ9- tetrahydrocannabinol (THC), cannabidol (CBD), cannabinol (CBN) and 11-nor-Δ9-carboxy-tetrahydrocannabinol (THC-COOH) in human hair. Methods Hair sample was spiked with deuterium labeled 11-nor-Δ9-carboxy- tetrahydrocannabinol (THC-COOH-d3) as internal standard, prior to being hydrolyzed with sodium hydroxide. The mixture was extracted with n-hexane/ethyl acetate (9: 1), derived with N,O-bis-(trimethylsilyl)-trifluoroacetamide (BSTFA), and analyzed with GC-MS/MS. Results The limit of detection of THC-COOH, THC, CBN and CBD were 4, 4, 10, and 20pg/mg, respectively. Calibration curves covered a range from 0.04 to 5 ng/mg with good linearity (r>0.999). The accuracy and precision of analytes all met the requirements. Conclusion The method has a good selectivity and high sensitivity, and is applicable to the analysis of CBD, CBN, THC and their metabolite THC-COOH. It has been verified in real cases.

    Related Articles | Metrics
    Study on Estimating Postmortem Interval with Factors Related to Body Temperature
    YANG Yu-lei, WU Rong-qi, FEI Geng, LIN Zhong-sheng, SHI Qun, XIAO Bi, WANG Li-yang, GE Yan-chang, MENG Hang, MA Kai-jun, CHEN Xin
    2012(5): 75-78. 
    Abstract ( )   PDF (544KB) ( )  

    Objective To statistically analyze the correlation between factors related to body temperature drop and postmortem interval, and to establish an innovative method for estimating postmortem interval by body temperature. Methods The collection standard of the factors influencing body temperature drop was established. Data of 157 cases which had exact postmortem intervals were collected. The related factors were quantitatively scored according to practical experience and basic statistic requirements. The data were processed by EXCEL and SPSS software, and the correlations between the factors and the postmortem intervals were analyzed with multiple linear regression. Results A statistically significant regression equation was obtained: Y = 25.993 + 0.04X1 + 0.172X2 + 0.88X3 +0.047X4+0.373X5+0.347X6-0.766X7. The correlation coefficient R2 was 0.876. Conclusion The study presented an innovation application of body temperature for estimating postmortem interval, which had been tested in the practical work.

    Related Articles | Metrics
    Disability Assessment for Hand Dysfunction Caused by Traffic Accident
    XIA Qing, FAN Li-hua, WU Jun
    2012(5): 79-82. 
    Abstract ( )   PDF (512KB) ( )  

    In the disability assessment after traffic accidents, evaluation of hand function is one of the focuses in clinical forensic medicine. The current Assessment for Body Impairment of the Injured in Road Traffic Accident provides the assigned proportion of hand function, which combines the ideas of foreign hand surgery experts with actual domestic situation of hand surgery. In evaluating hand function, the degree of dysfunction involved in defect, motion and sensation should be considered,and the proportion of lost function should be measured. Then applicable clause in the standard should be quoted. However, some problems still exist in the evaluation of hand function in our country, such as the ratio of DIP is higher than that of PIP, and the lack of the function evaluation about thumb adduction, abduction, palmar opposition and digital opposition. Evaluation methods of hand function need to be improved gradually in the forensic practice. While learning the successful experience abroad, we should not be out of context only for convenience. Otherwise we will neglect something important.

    Related Articles | Metrics
    The Application of CT and the Forensic Medical Examination of Nasal Fracture
    RUAN Jian-min, HONG Xiang
    2012(5): 83-85. 
    Abstract ( )   PDF (485KB) ( )  

    Objective To discuss the effect of CT technique applied in forensic medical examination of nasal fracture, and to propose a revision opinion on the current examination standard. Methods Cases that were concluded as minor injury in two different periods according to the results of X-ray and CT were collected. The influence of these two techniques on the forensic conclusion of nasal fracture was analyzed by Chi-square Test. Results Compared with X-ray, the application of CT has a more significant impact on the examination conclusions of nasal fracture. Therefore, the standard based on X-ray results is not consistent with the present situation any more. Conclusion Since the CT technique has been applied widely, a new examination standard should be made on the basis of CT technique.

    Related Articles | Metrics
    The Application of Exif in Digital Photo Authentication
    LU Qi-meng, SHI Shao-pei
    2012(5): 86-90. 
    Abstract ( )   PDF (1273KB) ( )  

    Exif analysis of digital photos is an important aspect in image authentication. It is crucial to thoroughly extract and fully apply the Exif information in the examination. Based on the analysis of JPEG format, the extraction method of Exif information is presented and the application of the thumbnails and image quality in Exif is discussed.

    Related Articles | Metrics
    Inspection of Vehicle Safety Conditions and Calculation of Vehicle Speed in Traffic Accidents
    ZHANG Zhi-yong
    2012(5): 91-93. 
    Abstract ( )   PDF (464KB) ( )  

    Objective To analyze the vehicle factors that might cause road traffic accidents. Methods The approaches and key points in the inspection of vehicle technical conditions were analyzed with real cases. The calculation method of vehicle speed was briefly discussed. Results The key points of inspecting the vehicle configuration, braking system, automotive lighting and signaling system and tires were summarized. Based on the calculation method of vehicle speed, the lorry in a rear-end accident was concluded as not reaching the low speed limit of the highway. Conclusion The key points ought to be followed during the inspection of vehicle technical safety conditions, so as to avoid road traffic accidents.

    Related Articles | Metrics
    Study on the Discrepancy of Fingerprints between the Questioned and the Known
    ZHANG Ya-ping, DANG Pan-feng, FU Xiao-hai
    2012(5): 94-96. 
    Abstract ( )   PDF (629KB) ( )  

    Objective To analyze the discrepancy laws between the questioned and known fingerprints by statistical data. Method The questioned and known fingerprints were put in Cartesian coordinates, where the coordinate parameters of every detailed characteristic of fingerprints were obtained. Then the discrepancies between every corresponding detailed characteristic of the two samples were analyzed with statistics to find out the causes and laws of those discrepancies. Results When pressing a fingerprint, the changes of force direction on the finger will lead to the distance discrepancies, and the changes of twisting and turning will lead to the angle discrepancies. Conclusion The discrepancies between the questioned and known fingerprints are caused by the different force directions and strengths when pressing. This study will provide a new method for the identification of deformed fingerprints.

    Related Articles | Metrics
    The Cartridge Case Traces of China 9mm Police Revolver
    SHOU Yuan-jing, ZHENG Xiao-chun, XU Bei
    2012(5): 97-104. 
    Abstract ( )   PDF (2331KB) ( )  

    Objective This study provides the theoretical basis for the cartridge case examination of China 9mm police revolver. Methods Test-fired cases from 10 revolvers were examined to study the shape, location and variation of each mark on them. Then 5 revolvers out of the 10 were selected and a second test was performed to confirm the conclusion drawn from the first. Results The results show regularities with respect to the soot mark, breech face mark and firing pin impression on cartridge cases, which were proved to be of remarkable value for firearm examination. Conclusion Combined with the firing pin impression, the breech face mark and soot mark can be used to orient the cartridge case and determine the possible firing order. Firing pin impression and breach face mark have their own individuality which can be used to determine whether a cartridge is fired by a particular revolver.

    Related Articles | Metrics
    Application of the Ninhydrin-dyed Method in the Detection of Human Epithelial Cells
    YANG Dian, LIU Chao, XU Qu-yi, ZHANG Yi
    2012(5): 105-107. 
    Abstract ( )   PDF (637KB) ( )  

    Objective To evaluate the applicability of the ninhydrin-dyed method in the detection of human epithelial cells. Method 258 samples of clothes, masks and staves which might bear epithelial cells, were dyed with 1% ninhydrin, and DNA specimens were extracted by the magnetic beads method. Then DNA quantification and STR genotyping were performed to the collected samples. Results 172 samples showed positive result, of which 115 had DNA concentrations above 0.02ng/μL and no less than 6 STR loci, with a detection rate of 66.86%. 86 samples showed negative result, of which neither DNA nor STR loci could be detected. Conclusion Ninhydrin-dyed method can be applied in the detection of human epithelial cells.

    Related Articles | Metrics