The camouflage of the crime scene means that at the scene of the crime, the perpetrators of the crime by deliberately changing the physical evidence to mislead the direction of the police investigation. The crime scene contains a lot of information, and this information may be used to identify the scene camouflage, but even those experienced investigators may ignore the information. There is no doubt that there are many cases in the field of camouflage, the actual number of camouflage scene is far more than the camouflage scene has been found. However, dynamic changes in evidence can alter, obscure or eliminate evidence, and cause the evidence to be unrecognizable. In order to identify the dynamic changes in evidence at the camouflage scene or other scene, the reconstructor needs to observe carefully the relationship between bloodstains, clothing, hair, body posture, bullet trajectory and other evidence. Rebuilders should have the knowledge, skills and abilities to interpret these evidence relationships.
In order to identify the camouflage of the crime scene, what type of evidence should the reconstruction personnel need to find? In general, we must look for evidence that does not correspond to the behavior reflected or reflected in the overall situation. In some cases, there may be only one evidence that does not match the logical process of a particular event or series of events, or that the absence of an evidence does not match the logical process of a particular event or series of events. In other cases, the act of disguising the scene may be confirmed by conflicting evidence of many interrelated evidence. Each case has its own uniqueness, and therefore must be carefully scrutinized.
Some of the topics discussed below will help rebuild people to deal with camouflage on-site issues, of course, these topics can not be exhaustive. These questions are designed to further inspire the imagination of rebuilding people and guide them to constantly explore new areas. These problems do not exhaust all possibilities.
Site entrances and exits
Among the many elements involved in the camouflage scene, the most common is open or broken windows. People engaged in the crime scene simulation work that this situation gives rise to the impression that the perpetrator may be from the location into the crime scene. Therefore, for the reconstruction of personnel, check the crime scene of the entrance and exports is essential. The following guiding principles may be of considerable benefit to the redeveloper: to determine all imports and exports (doors, windows, passages, roads, etc.) at the crime scene; to determine whether these locations can be accessed at the time of the crime (for example, certain windows and doors may (Blood, fingerprints, broken glass, dropped items, etc.) and the reverse of the transfer of evidence on the scene of the crime (such as blood, fingerprints, broken glass, dropped items, etc.) and reverse Transfer evidence (lack of footprints in the dust outside the window, lack of traces of violence, etc.) to determine whether these sites are related to criminal activity; to determine whether the import and export of the crime scene may coincide with the manifestation of the criminal act, From the outside through the use of violent means to enter the scene, took the valuables, and the existence of the necessary evidence of the transfer - which may need to be carried out by the reconstruction of the corresponding experiments.
As evidence of the location of the crime scene is subject to change or transfer, it is determined whether there is sufficient evidence that the perpetrator enters and leaves the crime scene as expected, which is usually the most decisive feature of determining whether the crime scene is disguised The Many camouflage cases of homicide involved in the victim's home to implement the burglary behavior. Strange criminals need to enter the crime scene, also need to leave the crime scene. By analyzing the location characteristics of the crime scene, such as doors locked by double doors, or windows with dusty surfaces, it is possible to exclude other possibilities and to determine the presence of camouflage at the crime scene.
A weapon at a crime scene or taken from a crime scene
For all the weapons found on the scene of the crime, the following questions need to be addressed: Is the weapon found around the victim the weapon that is causing the injury? If the answer is no, why is the weapon appearing at the scene of the crime? Is there any other weapon? Is the weapon used for a specific purpose?
In some cases, there was evidence that someone had used weapons at the crime scene, but failed to find any weapons at the scene of the crime. For every crime scene, investigators must identify whether there is evidence that someone has taken weapons from the crime scene. If you can prove this fact, you need to continue to identify the purpose of the people take the weapon? If the answer to the first question is no, then there is no need to answer the second question.
Many types of guns are the most likely weapons of disguise at the crime scene. In view of this, the rebuilding staff must carefully answer some of the basic questions related to the various types of firearms in order to determine the link between the firearms and the criminal acts.
First, is the victim's wound consistent with what he says? In suicides, can the victim pull himself on the trigger? Secondly, we must ascertain whether the gun is properly filled with the bullet, whether with the field evidence and Witnesses testimony consistent with the other need to pay attention to is the question, is found in the crime scene of the guns are flawed? The gun can install multiple bullets and launch bullets?
These issues help to identify specific guns involved in a particular case. In cases involving firearms, not only those cases involving camouflage scenes of crime, the rebuilders must accurately answer the questions in each case.
The composition of the powdery sediments consists of carbon, soot, unburned gunpowder, and the components of the shot residue. Burning gunpowder is sprayed from the barrel (and other locations, depending on the design structure of the gun) and is in contact with the skin to form traces of gunpowder. These gunpowder sediments should be consistent with the presumed formation.
Many suicides are caused by contact shoots or close contact shot. In this case, the distribution of gunpowder must be consistent with the situation caused by the gunman. If you can not find the gunpowder, it means that the shooting distance or the middle there are obstacles.
The gunpowder's gunpowder can fly from the gun firing position to a victim's wound position three feet away. The forensic pathologist must check the traces of the bullet in order to determine the presence of gunpowder particles. However, if there is only one powder particles, the powder particles can not be used as sufficient evidence for close shooting, because the bullets have been fired in the lubricating oil can be attached to the powder particles, the powder particles may fly along with the bullets for some distance.
In order to extract the shot residue in the hands of the victim, the gun needs to be fired at the location near the victim's hand, and if the distance is close enough, it will form a powdery sedative and may even form a traces of gunpowder. This gunpowder sediments may not be consistent with the manner in which the guns are held. In other words, because of the possession of firearms in the hands, will lead to powder off the phenomenon of a blank intermittent phenomenon, this phenomenon is usually clear. If these forms are abnormal, it may indicate that there is camouflage on site.
The movement of the body
It is not uncommon for the scene of the camouflage of the victim's body to be transferred to the second scene or the "dead space". Often, the perpetrators are disguised at the scene of the corpse of the body, which may even be due to the body fell to a specific location, which led to the movement of the body is very convenient. Specific circumstances may include: the body can not be found before the body can not be moved, or can not completely clean the crime scene. In order to determine the specific reasons, the rebuilding staff must carefully examine the various circumstances and circumstances of the crime scene, so as to effectively solve the problem. At each crime scene, the specific inspection results will depend on the interaction between the victim and the victim's environment, as well as the expected transfer of evidence.
Factors to be considered by the rebuilders include, of course, not limited to: the evidence of the traces of traces present on the ground and surrounding objects (including the folded carpets, the soil of the heel tow, the blood that extends from the other room, etc.) (The direction of blood deposition is opposite to gravity); the corpse that is inconsistent with the posture of the corpse, and the corpse is not consistent with the posture of the corpse Joint stiffness and gravity of the opposite); in the original should not appear blood position found evidence of blood; found in the body of trace substances and the crime scene is not associated.
Is the victim's clothes pulled or rolled in a specific direction? If someone is dragged on his feet, his shirt will be lifted to the top, the most distorted position of the clothes is the position where the body is in contact with the ground. If someone is dragged on, his pants will be dragged down, the shirt will be stretched very tight, his feet will show out of the state. At the same time, his hand may be placed in a "normal" posture.
Rebuilders also need to focus on whether the victim's clothes have been taken off or taken away from the crime scene. What is the purpose of the move? The victim's clothes pocket has been flipped? These clothes pocket was pulled out or even pulled (B) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) Whether there is any unusual place in the clothes of the victim? Is there anything in the clothes or whether something has entered the clothes? Does the crime scene seem to have been reorganized after the victim has been attacked? If that is the case, So why should the victim's clothes be taken off first, and why did the criminals take the trouble to re-wear the clothes to the victim, and what purpose did the criminals want to achieve?
Rebuilders need to experiment to determine why the victim's clothes are present at the time of the incident.
In a traffic accident, the victim's soles may have parallel scratches, indicating the direction and position of the victim's body and the standing feet being damaged. If the victim's soles do not have such scratches, then, or that the accident occurred when the speed is very low, or that the body was stabbed here.
Reconstruction personnel should be concerned about whether the victim's shoes match the feet and whether there is any transfer evidence on the victim's shoes that is inconsistent with the crime scene? Is the victim wearing the shoes in the course of the crime or the victim's foot (Blood, damage, or evidence of transfer at the crime scene, such as soil or gravel) indicates that the shoe may have been taken off? Where is the knot of the victim's lace?
People wear their own shoes, usually bent down and in the middle of the shoes on the shoelaces, or lift a leg on the other side of the legs, and then tied to the shoelaces, when the lace hit the knot is located in the legs Of the inside. When a mother to their children to wear shoes, may also be tied to shoelaces, this time, the shoelaces will be located on the outside of the legs. When the perpetrator to the victim to wear shoes, it is easy to make such mistakes.
Blood can record the relevant behavior of the wounded blood. The general rule that blood needs to follow is the law of gravity. The blood is usually vertical downward movement, only in the role of other external forces will turn to other directions. Again, the blood usually moves down vertically and does not move horizontally.
First of all, taking into account the location of the body and the law of gravity, the crime scene of the blood is actually moving along the direction should be followed? Second, the blood is the victim and the suspects claim to be consistent with the behavior?
The position of the hair is a clue that is usually overlooked. The victim's hair is usually able to reflect why the victim showed the posture of the incident. This situation is particularly evident in the long hair of the victim, but it is not limited to long hair situation, because the short hair may also show the state of movement.
When someone is pushed, her hair will stretch her in the direction of her. If a person's hair is first lifted and lowered, her hair will show a pattern of "high roll" (a high hair style).
In fact, if someone is dragged by an arm, there will be only one side of the hair showing this "high volume" mode. When a man with long hair on his back to the ground, her hair will spread from the head scattered, showing a halo of the general distribution. If a long hair man leans down to the ground, her hair will spread from the head, and the hair will not be located below the face.
Hair also follow the law of gravity, the hair usually appears to fall state, unless the role of external forces. Damage to the victim before death can cause the hair to stick to the side of the head due to blood clotting. The dry blood may also show the movement of the hair on the plane. Hair can show a very clear stripes pattern. In discussing all these clues, we must understand how the victim's body is bent and exercised, and we must bear in mind the role of gravity.