What are the functions of traces and physical evidence 5

Trace evidence is a kind of physical evidence, which includes handprints, footprints, gunshot marks, tool traces, and special traces (such as lock marks, vehicle traces, etc.). Traces not only play a role as physical evidence, but also provide an objective basis for judging the nature of the incident, provide material for case analysis, provide direction and clues for investigation and solving cases, and provide evidence for case litigation. In fact, the role of traces is very well explained in many film and television works, such as the American drama CSI.

Physical evidence refers to all kinds of objectively existing items, substances or traces that can prove the true situation of the case by their external characteristics, material attributes, location and state, and the role of physical evidence is to prove the true situation of the case. Therefore, it can be said that some traces can appear as physical evidence, while many traces cannot appear as physical evidence because they do not possess the same identification attribute or other essential attributes, and can only be used as material for analyzing the case. Physical evidence, on the other hand, includes trace physical evidence, which can prove the evidence of implementation. When presented as evidence, they are all circumstantial evidence.

Traces are not a type of evidence prescribed by law, it may be physical evidence or documentary evidence, but it generally belongs to original evidence and circumstantial evidence, which can prove the facts of the case after forming a complete chain of evidence.

For reconnaissance, for censorship,

Traces and physical evidence are not parallel concepts, trace physical evidence is one of the types of physical evidence. Its concept and role are as follows:

1. Physical evidence refers to physical objects or traces that prove the circumstances of a case by external characteristics, material attributes, location, and status. Such as crime tools, leftovers at the scene, stolen goods, bloodstains, sperm spots, footprints, etc. Physical evidence is a type of evidence.

The greatest function of physical evidence is that the physical evidence that has been verified and found to be true can be used as the basis for a verdict.

2. Trace physical evidence refers to all kinds of objective traces that can prove the true situation of a case by their appearance and structure, the increase or decrease of objects, changes in their positions, and their status. Its properties are specific characteristics that are reflected by changes in its surface structure or morphology. In fact, trace evidence is a term that appears to distinguish it from documentary evidence, physical evidence of persons and physical evidence of objects.

The role of trace evidence:

1. Provide information about the facts of the crime;

2. Provide information on the modus operandi of the crime;

3 Provide information about the connection between a person and the crime scene;

4 Provide information on the offender's personal situation.

Trace evidence examination is an important forensic scientific method used to determine trace evidence in criminal cases, such as bloodstains, fingerprints, fibers, etc., to provide evidence to support criminal investigation and judicial trial. However, there are some drawbacks to the examination of trace evidence, including the following:

1.Subjective influence: The examination of trace evidence relies on the subjective judgment and interpretation of forensic scientists. Different experts may have different opinions on the same piece of trace evidence as Tong Min, which may lead to uncertainty and controversy over the results of the examination.

2.Technical limitations: Although the technology of trace evidence inspection is constantly improving, there are still certain technical limitations.

For example, certain types of traces may be damaged or contaminated, providing reliable inspection results. In addition, some emerging inspection techniques may require more research and validation to ensure their accuracy and reliability.

3.Misunderstanding and misuse: In some cases, the results of the physical evidence examination may be misinterpreted or misused.

During the trial, the lawyer may challenge the test results or interpret them differently, sometimes with a lack of scientific literacy or misleading intent. This can lead to the unfairness or inaccuracy of judicial decisions.

4.Cost and time: Trace evidence inspection often takes a lot of time and resources. For some forensic science laboratories and investigative agencies in Rangluncong, the lack of adequate funding and manpower can lead to delays and quality problems in the inspection work.

In order to overcome these drawbacks, it is necessary to further develop and improve the technology of trace and physical evidence inspection, strengthen the training and quality control of experts, and improve the accuracy and repeatability of inspection results. In addition, the legal and scientific communities need to work closely together to ensure the proper understanding and use of scientific evidence to guarantee the fairness and effectiveness of the justice system.

Trace evidence examination is a forensic scientific and technical means, which is used to identify and analyze various traces of crime scenes or criminal suspects, such as fingerprints, footprints, bloodstains, fibers, etc., to provide evidence for criminal investigation and judicial trial. Its disadvantages are as follows:

1.Errors and uncertainties: Although scientific methods are used in the examination of trace evidence, there are still errors and uncertainties. When analyzing and comparing traces, misjudgments, omissions, or misidentifications may occur, resulting in inaccurate results.

2.Interference by external factors: Trace evidence is susceptible to interference from the external environment, such as pollution of early cherry blossoms, deterioration, natural damage, etc., which may lead to the loss or deformation of traces and affect the reliability of analysis results. Land disturbances.

3.Inability to determine time and place: Trace evidence often only determines the presence of a trace, but it cannot determine the exact time and place. This limits the detailed restoration of the circumstances of the case and the determination of important details.

4.High professional requirements: The inspection of trace evidence requires a high degree of professional technology and experience, and the inspectors are required to have rich knowledge and skills. Inexperienced or unskilled inspectors may compromise the accuracy of the results.

5.Limited by technology and equipment: The accuracy and reliability of trace evidence examination is also limited by the technology and equipment available. If the technical level is not advanced enough or the equipment is not sensitive enough, it may affect the analysis and judgment of the results.

Trace evidence examination is an important crime scene investigation technology, which analyzes the physical, chemical, biological characteristics and other information of the traces by examining the traces on the surface of the object, and determines the key information such as the identity of the suspect, the trajectory of the behavior, and the means of committing the crime. The examination of trace evidence usually includes the steps of searching for fingerprints, footprints, bloodstains, hair, fibers and other substances, testing, and comparison. Among them, fingerprint examination is the most common method of trace physical evidence examination, which can determine the identity of the suspect through the morphology, texture, sweat gland distribution and other characteristics of the fingerprint.

Footprint testing is to determine the trajectory of the suspect by analyzing the imprints on the soles of the shoes. The examination of bloodstains, hair, and other substances can be used to determine the identity of the suspect through DNA comparison and other technologies. In conclusion, the examination of physical evidence is a very important on-site investigation technique, which can provide important evidence and clues for crime detection.

Trace evidence examination is a very important method in criminal investigation, which is mainly used to examine the traces and physical evidence left at the crime scene and the suspect's body to determine the truth of the case and the identity of the criminal. Trace evidence can include bloodstains, fingerprints, hair, fibers, shoe prints, tool marks, etc. When conducting the examination of trace evidence, it is first necessary to collect physical evidence samples, such as blood collection, fingerprint extraction, hair collection, etc., and then conduct inspection and analysis through a series of chemical, physical, biological and other methods to determine the quality and nature of physical evidence.

The results of the examination of traces and physical evidence are directly related to the characterization of the case and the conviction of the case, so it is necessary to ensure the scientificity, accuracy and reliability of the examination process. When conducting trace evidence inspection, it is necessary to comply with relevant laws, regulations and technical standards to ensure the legitimacy and credibility of the inspection results.